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1·When I returned , the water had all boiled away and the falme burnt a hole in the kettle.

等我回来时，水都烧干了，壶底烧出了一个窟窿。

2·When I returned, the water had all boiled away and the flame had burnt a hole in the kettle.

我回来时，水都烧干了，火把壶底烧出了一个窟窿。