柯林斯詞典beforehand /b??f???h?nd/ 1. ADV If you do something beforehand, you do it earlier than a particular event. 事先; 預(yù)先 How could she tell beforehand that I was going to go out? 她如何預(yù)先知道我將出門(mén)的？ 返回 beforehand劍橋詞典earlier (than a particular time ) 事先，預(yù)先 I knew she was coming that afternoon because she had phoned beforehand to say so. 我知道她那天下午要來(lái)，因爲(wèi)她事先打電話(huà)跟我說(shuō)過(guò)。 返回 beforehand