中英释义：
双语例句
我们经常承诺做某事，但在干活时却拖拖拉拉。
We promise to do something usually, but we may be dragging our feer when we are doing them.
重点词汇
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承诺
commitment; promise; pledge; word; bond; assurance; undertaking; covenant; commit; undertake; warrant; guarantee; promise to do sth; undertake to do sth; make a promise; give one's word
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某事
something