What caused an apple to fall to the ground?
是什么使得苹果落到地上的？
He wanted to see this tree fall to the ground.
他特别想知道这棵树倒在地上是什么样子。
They need to have those courses to hit the ground running in the fall.
他们需要在秋季学期积极着手进行这些课程。
They need to have those courses to hit the ground running in the fall.
他们需要在秋季学期积极着手进行这些课程。
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