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to blow hot and cold 出尔反尔（成语）
英文释义
(IDIOM) To vacillate; to change one's opinion in a weak, indecisive way.
例句
The boss often blows hot and cold, depending on his mood, and so no one can predict his decisions on anything.
这位老板总是出尔反尔，一切取决于他的情绪，所以没人能预测他的任何决定。
