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Isaac Newton
艾萨克-牛顿
Who is Isaac Newton?
谁是艾萨克-牛顿？
He is one of the greatest scientists in history.
他是历史上最伟大的科学家之一。
He found very important scientific facts including gravity.
他发现了包括万有引力在内的非常重要的科学事实。
Do you know how he found gravity?
你知道他是怎样发现万有引力的吗？
Every time he saw fallen apples under apple trees, Newton wondered why do apples always fall to the ground.
每次他在苹果树下看到掉落的苹果，牛顿就想知道为什么苹果总是掉在地上？
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种力量吸引着这些苹果。
Later, he discovered that the gravity of the Earth pulls things.
后来，他发现是地球的引力吸引着物体。
Why is his discovery important to us?
为什么他的发现很重要？
If people don't know about gravity, they cannot travel to the moon.
如果人类不知道万有引力的话，他们就去不了月球。
