| 短语 | vain threat / promise etc |
| 释义 | vain threat / promise etc literarya threat, promise etc that is not worrying because the person cannot do what they say they will空洞的威胁/承诺等—vainly adv:•The instructor struggled vainly to open his parachute.教官拼命想打开降落伞，但没有成功。 |
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