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Sharks can hide themselves because of their colouring. They are dark on top and silver on the underside and look like the colour of the water in which they live. In order to stay alive, animals need to have keen senses. Fish and some shellfish have sharp eyes. Almost all animals are sensitive to touch. Fish detect movements in the water by means of their lateral lines. Fish and other sea animals can hear well and many of them can make different types of warning sounds. In the future you will be hearing more and more about the sea. It is one of the last training places on Earth, which has not been fully explored by men. Today, more and more scientists are exploring the sea. This is because the population of the Earth is increasing so fast that very soon the land alone will not be able to provide enough food for everbody. That is why man is turning to the sea. It is like a huge storehouse. It contains not only food but also many other valuable things such as oil and minerals. The sea can also provide us with a lot of fresh water.
鯊魚能夠隱藏自己是因為他們的顏色。它們頂部是深色的，下邊是因為，看上去就像它們居住的海洋的環(huán)境。 為了生存下來，動物需要有敏銳的感覺。魚和一些貝殼類動物有敏銳的眼睛，幾乎所有的動物對觸覺都很敏感。魚依靠側(cè)線來察覺水中的活動，魚和其他的海洋動物有很好的聽覺，而且它們能產(chǎn)生很多不同種類的警覺聲音。 在未來，你可能會聽到越來越多關(guān)于海洋的事情。海洋是地球上還沒有完全被人類開發(fā)的地方之一。今天，越來越多的科學(xué)家開發(fā)海洋。這是因為地球上人類數(shù)量增長迅速，很快陸地上的資源不夠給予給每個人足夠的食物，這就是為什么人類會轉(zhuǎn)向探索大海。這就像一個寶藏。它不僅僅有食物，而且還有很多寶貴的東西，像石油和礦物。 海洋還可以提供給我們新鮮的水資源。 ——By lsy34