小伙伴們，今天的你有沒有好好復(fù)習(xí)呢？下面，幫考網(wǎng)為大家準備了一些關(guān)于托?？荚嚨牧?xí)題，供大家練習(xí)，希望能夠?qū)Υ蠹矣兴鶐椭?。一起來看?o:p>

To us, the environment in which fish dwell often seems cold, dark, and mysterious.

對我們來說，魚類居住的環(huán)境通常顯得冰冷，黑暗，而且神秘。

But there are advantages to living in water, and they have played an important role in making fish what they are.

但是生活在水中是有些優(yōu)勢的，并且他們(這些優(yōu)勢)扮演了一個重要的角色，使魚之所以是魚。

One is that water isn`t subject to sudden temperature changes.

其一是水不會受制于溫度的突變。

Therefore it makes an excellent habitat for a cold-blooded animal.

因此對于冷血動物來說它制造了一個優(yōu)秀的生活環(huán)境。

Another advantage is the water`s ability to easily support body weight.

另一個優(yōu)勢是水有輕易的支撐身體重量的能力

Protoplasm has approximately the same density as water, so a fish in water is almost weightless.

細胞質(zhì)同水有著大致相同的密度，因此一條魚在水中幾乎是無重量的。

This "weightlessness" in turn means two things: One, a fish can get along with a light weight and simple bone structure, and two, limitations to a fish`s size are practically removed.

這個“沒有重量”依次意味著兩件事：一，一條魚可以同一個輕的體重以及簡單的骨骼結(jié)構(gòu)相處的很好，還有二，對一條魚的大小限制幾乎移除了。

Yet there is one basic difficulty to living in water—the fact that it`s incompressible.

但是在水中生活還有一個基本的困難——它不能壓縮的事實。

For a fish to move through water, it must actually shove it aside. Most can do this by wiggling back and forth in snakelike motion.

對于要穿過水中的一條魚，實際上它必須從它的側(cè)面推動。大多數(shù)做到這點是通過蛇一樣的動作來回擺動。

The fish pushes water aside by the forward motion of its head, and with the curve of its body and its flexible tail.

魚類通過它們頭部向前的動作，身體的彎曲以及它的有彈性的尾巴把水推到一邊。

Next, the water flows back along the fish`s narrowing sides, closing in at the tail, and helping the fish propel itself forward.

接下來，水順著魚類變窄的兩側(cè)流回，在尾巴處合流，然后幫助魚推行它們自己向前。

The fact that water is incomprehensible has literally shaped the development of fish.

水是不可壓縮的事實，正確地塑造了魚類的發(fā)展。

A flat and angular shape can be moved through water only with difficulty.

一個平直的和有角度的形狀能穿過水中被移動，只是會很吃力。

And for this reason, fish have a basic shape that is beautifully adapted to deal with this peculiarity.

由于這個原因，魚類有一個基本的能漂亮適應(yīng)的外形去對付這種特性。

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