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You can pre-empt pain by taking a painkiller at the first warning sign.
刚出现征兆时，就服用止痛片来预防疼痛。
《柯林斯高阶英汉双解学习词典》
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The workers took control of the factory in order to pre-empt its sale by the owners.
工人们 先发制人 接管了工厂以阻止厂主将工厂出售.
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