追根究底談鯊魚
Sharks may not be friendly, but they are fascinating .
But the big thing that gives the shark its edge in the ocean is its sensory package. The package includes the shark's eyes, ears, skin, nose and mouth, as well as electric sensing.
A shark's nose is probably its most important sense. If you were to put a single drop of blood in an Olympic-size swimming pool, a great white shark could smell that. And they can tell the direction that the smell is coming from. Many sharks can also hear sounds of distress from miles away.
Sharks handle their electric sensing using cells located in the head. Whenever something moves using its muscles, a shark can detect the electrical impulses flowing to those muscles. A shark can electrically "see" anything that has muscles even if it is hiding or the water is murky.
Sharks even have vibration sensors in their skin. When something moves near the shark, tubes pick up the pressure changes and hairs inside the tubes send signals to the brain. This extra sense allows a shark to turn quickly and attack again.
When you put all these different senses together, it makes the shark a nearly ideal hunter. A shark can detect prey from miles away and then use eyes, electrosensing （electric sense) and movement sensing to home in.
Strangely, sharks do not seem to use these senses to home in on people. The very low number of shark attacks tells us that sharks don't hunt human prey on a regular basis. ( the good news is human being is not the fist prey for sharks :)）
On the other hand, people love to hunt sharks. Millions and millions of sharks die every year. Without protection, extinction is a definite possibility.
prime (adj)-refer to the best quality or most important, or the best time. 主要的，首要，重要的 The busy intersection is a prime location for a convenience store.
*Housewives are our prime customers.
*The prime time of restaurants is between 6:30 PM and 8:30 PM.
*The Oscars will be broadcast during prime time.
absolutely (adv)-These pictures you took of the mountains and river are absolutely beautiful
fin (n)-The fins on a fish's body help it swim. 鱼翅
fascinating-extreme interesting.
illusion-appeal is to be true, but it isn't.
absolutely-totally, completely.
maneuverability- refer to move quickly and easy in the water. 机动性或操纵的灵巧性。
maneuver-巧妙的操作。
*Power-steering improves the maneuverability of a car. 动力方向盘加增车的灵活操纵性。
propeller-something is in the back of the boat that spin and make the boat move faster.螺旋桨 edge (n)- side, here refer to what make shark a little bid sharp than others.一般指边缘， 此指优势，优越条件。
Ken's skill at playing basketball gave his team an edge during the game.
*Because of his language skills, he has an edge over the other applicants.
*Her years of experience gave her an extra edge in the field. 多年的经验使她在专业领域中，有特别的优势。
impulse (n)-small, short, quick bust of electric. Our body has impulse whenever we move.
When you touch something, your skin sends an impulse to your brain.
impulsive-someone do things quickly without too much thinking. You are very impulsive.
murky (adj)-mix up the water, is cloudy. 暗的，含糊的，混浊的。複雜的.
After the storm, the water was so murky, we couldn't see the bottom of the lake.
*The water in the river became murky and dirty after the typhoon.
*She wants to forget about her murky past and move on. 忘记複雜的过去, 重新开始,向前迈步.
prey (n)- is something predator eats.猎物 (人或物). 侵袭目标,对象.
Snakes hunt prey such as mice and small birds.
*The eagle swooped down and caught its prey.
*The thief is looking for his next prey. 小偷寻找下一个下手的对象目标.
prey on -Wolves prey on rabbits.
definite (adj)-certainly.
There is a definite relationship between how much people exercise and their health.
home in -use the sensors to move closer and closer to your goal. .瞄准. 针对.
home in on someone or something. 准确的对准某个对象
Our discussion should home in on the solution to the problem.在针对问题的解决方法加以讨论.
The fighter plane homed in on a tank on the ground. 战斗机瞄准地上的一辆坦克车.
"see"-here refer to sense.
vibration-big music speak, you can hear the air vibrant. 震动,电波.
Set your cell phone on vibration mode.
extinction- extinct- die out, disappear, no longer exist.
ideal-perfect for
How the shark is such a deadly hunter?
Grammar:
But that is something of an illusion.
something of a =to some extent, in some ways.
But that is in some ways an illusion.
Although the performance was meant to be a high-class production, in the end, it turned out to become something of a joke.
Ernesto enjoys being funny; he is something of a class clown.
Chat Room
is prime time for shark attack. 全胜时期。
prime time- (T.V. 7-10P.M , usually is earn the most of Ad. money, most people watching) 黄金档，黄金时段。最受欢迎或最拥挤的时段。
high time-时机成熟的时刻，到了应该立即去做某事的时刻。
It's high time for us to go.
It's high time to clean up the room.
It's high time to take break.
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Shark-
loan shark-is a person who loans something money requested extremely high return, charge big interest.
card shark- is a person cheat in distributing cards to win big.
loan shark or card shark, both should stay away.
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..tubes pick up the pressure changes.- send or deliver 察觉，感应到，发现，雷达可以发现敌机 pick up a bad habit-很容易学会，学得，学会。在学习上有天份。
Can you pick up some milk for me? 购买东西。
You can pick up your co-worker to work , and drop off her after work. 去接他。
pick up someone-接人。
No one gets pick up by the police-逮捕。
pick up speed-increase, accelerate the speed.
pickup (n)- a open cargo area truck. 载货用的小卡车
pick up where we leave off. 拾起，捡起
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