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重点讲解：
1. all at once 同时；一起；
例句：A number of things happened all at once.
几件事一起发生了。
2. as usual 像平常一样；照例；
例句：She was getting breakfast as usual.
她像往常一样在准备早餐。
3. thanks to 幸亏；归因于；
例句：They were already under stress, thanks to the aftershock of last year's drought.
去年遭受的旱灾让他们心有余悸、倍感忧虑。
4. lead sb. to do sth. 促使；使得；使；
例句：His actions lead me to distrust him.
他的行为使我不信任他。
n. 子孙，后代，产物
