From what I remember, water changes back and forth from water in lakes and oceans to vapor, and then back to water again when it falls as rain or snow, as precipitation.

根据我的记忆，水往复地变化，从湖泊和海洋里的水变成水蒸气，然后当它以雨或雪——也就是降水的形式落下时又变成水。

youdao

I ride it to school and then back to the dorms everyday.

我每天乘那班车去学校再回宿舍。

youdao

Listing 5 shows the results of migrating down and then back up.

清单5显示了向下迁移然后回退的结果。

youdao

The short wave signals bounce off the ionosphere that surrounds the Earth,back to the ground and then back to the ionosphere.

VOA: special.2010.12.08

He started with the lowest instruments and then goes to the high instruments and then back to low instruments at the end.

他开始使用声音最低的乐器,然后转向高音乐器,最后回到声音低沉的乐器

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and then over the Pulaski Bridge into Brooklyn and then back home.

再经过Pulaski大桥，到布鲁克林，最后回到家。

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Let your awareness drift up, and then back down, your entire body for 5 minutes.

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The open-top bus went through Lakeside, into the town centre, and then back to the Keepmoat.

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The slow upper-body motions brought him in closer and then back and away and around again.

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