As the sun rose the frog dispersed.
太阳一出来雾就消散。
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They strolled into the garden as the music ceased.
音乐声一停，他们就走进花园。
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二. 在某事发生的过程中另一事发生
I heard the murmur of their voices as I crossed the hall.
我走过大厅的时候听到他们在嘀咕什么。
（两个动作都是一般时态）
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Just as he was speaking there was a loud explosion.
正当他在说话的时候，一声巨响。
（从句用进行时态）
三. 两个动作同时发生
He smiled as he passed.
他路过的时候笑了一下。
（两个都是短暂动作）
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As she sang, the tears ran down her cheeks.
她一边唱歌，眼泪一边从脸颊淌下。
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Helen heard the story as she washed.
海伦一边洗衣服一边听故事。
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He saw that she was smiling as she read.
他看到她一边看着书一边笑。
（两个都是延续性动作）
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We get wiser as we get older.
我们随着年龄的增长而变得聪明起来。
（随着时间的变化而变化）
