四级When children understand that the light of the lightning flashing reaches their eyes almost at the same moment, but the sound of the thunder takes about 5 seconds to travel just one mile, they can begin to time the interval between the flash and the crash to learn how close they were to the actual spark.
当孩子们明白闪电的光几乎在同一时刻到达他们的眼睛,但雷声只需5秒就可以传播一英里时,他们可以开始计时闪电和撞击之间的间隔,以了解他们离实际火花有多近。
1994年1月大学英语四级(CET-4)真题
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