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If the 23 million cubic kilometers of ice in the world melted at the same time， the volume of the oceans would increase only 1.7 percent， but this would be enough for the sea level to rise about 180 feet. The Empire State Building would be in water to nearly the twentieth floor.
如果地球上2，300萬立方公里的冰同時融化，海洋的體積也只增加1.7%，但這將足以使海平面升高180英尺，帝國大廈將有20層淹在水中。
Plant life could not exist without lightning. Nitrogen is an essential food for plants. The atmosphere is 80 percent nitrogen， but in a form that is insoluble and unusable. It is the intense heat of lightning that forces the nitrogen to combine with oxygen in the air， forming nitrogen oxides that are soluble in water and fall to the earth in rain as dilute nitric acid. This reacts with minerals in the ground to become nitrates on which the plants depend.
要是沒有閃電，植物就不可能生存。氮是植物一種必不可少的養(yǎng)分。其中80%是氮，可是不溶于水，無法為植物利用。閃電的高溫是氮和空氣中的氧化合成能溶于水的氧化氮，隨雨水進入土地，稀釋成硝酸。硝酸和地里的礦物作用，形成植物必需的硝酸鹽。
Tuna swim at a steady rate of nine miles per hour for an indefinite period of time-and they never stop moving. Estimates indicate that a fifteen-year-old tuna must have traveled one million miles in its lifetime.
金槍魚總是以每小時9英里的均恒速度無限地在游動——他們從不停下來。據(jù)估計一條15歲的金槍魚一生中游程達100萬英里。
The lungfish can live out of water in a state of suspended animation for three years.
肺魚離水后以暫不活動的狀態(tài)可存活3年。
Because its eyeball is fixed， the whale must move its huge body to shift its line of sight.
鯨魚的眼球是固定的，它必須移動巨大的身體才能改變其視線。
A whale's heart beats only nine times a minute.
鯨魚的心臟每分鐘只搏動9次。
No one has ever been able to domesticate the African elephant. Only the Indian elephant can be trained by man.
從來沒有人能馴服非洲象。只有印度象能接受人的訓練。
The bat is the only mammal that can fly.
蝙蝠是會飛的哺乳動物。
If the 23 million cubic kilometers of ice in the world melted at the same time， the volume of the oceans would increase only 1.7 percent， but this would be enough for the sea level to rise about 180 feet. The Empire State Building would be in water to nearly the twentieth floor.
如果地球上2，300萬立方公里的冰同時融化，海洋的體積也只增加1.7%，但這將足以使海平面升高180英尺，帝國大廈將有20層淹在水中。
Plant life could not exist without lightning. Nitrogen is an essential food for plants. The atmosphere is 80 percent nitrogen， but in a form that is insoluble and unusable. It is the intense heat of lightning that forces the nitrogen to combine with oxygen in the air， forming nitrogen oxides that are soluble in water and fall to the earth in rain as dilute nitric acid. This reacts with minerals in the ground to become nitrates on which the plants depend.
要是沒有閃電，植物就不可能生存。氮是植物一種必不可少的養(yǎng)分。其中80%是氮，可是不溶于水，無法為植物利用。閃電的高溫是氮和空氣中的氧化合成能溶于水的氧化氮，隨雨水進入土地，稀釋成硝酸。硝酸和地里的礦物作用，形成植物必需的硝酸鹽。
Tuna swim at a steady rate of nine miles per hour for an indefinite period of time-and they never stop moving. Estimates indicate that a fifteen-year-old tuna must have traveled one million miles in its lifetime.
金槍魚總是以每小時9英里的均恒速度無限地在游動——他們從不停下來。據(jù)估計一條15歲的金槍魚一生中游程達100萬英里。
The lungfish can live out of water in a state of suspended animation for three years.
肺魚離水后以暫不活動的狀態(tài)可存活3年。
Because its eyeball is fixed， the whale must move its huge body to shift its line of sight.
鯨魚的眼球是固定的，它必須移動巨大的身體才能改變其視線。
A whale's heart beats only nine times a minute.
鯨魚的心臟每分鐘只搏動9次。
No one has ever been able to domesticate the African elephant. Only the Indian elephant can be trained by man.
從來沒有人能馴服非洲象。只有印度象能接受人的訓練。
The bat is the only mammal that can fly.
蝙蝠是會飛的哺乳動物。