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Isaac Newton
艾薩克-牛頓
Who is Isaac Newton?
誰是艾薩克-牛頓？
He is one of the greatest scientists in history.
他是歷史上最偉大的科學(xué)家之一。
He found very important scientific facts including gravity.
他發(fā)現(xiàn)了包括萬有引力在內(nèi)的非常重要的科學(xué)事實。
Do you know how he found gravity?
你知道他是怎樣發(fā)現(xiàn)萬有引力的嗎？
Every time he saw fallen apples under apple trees, Newton wondered why do apples always fall to the ground.
每次他在蘋果樹下看到掉落的蘋果，牛頓就想知道為什么蘋果總是掉在地上？
Then he thought that there must be some power of the Earth that pulls the apples.
之后他想一定是地球的某種力量吸引著這些蘋果。
Later, he discovered that the gravity of the Earth pulls things.
后來，他發(fā)現(xiàn)是地球的引力吸引著物體。
Why is his discovery important to us?
為什么他的發(fā)現(xiàn)很重要？
If people don't know about gravity, they cannot travel to the moon.
如果人類不知道萬有引力的話，他們就去不了月球。
