before 基本解释
prep. 在…之前；先于，优于；当着…的面；与其…
conj. 在…之前；在…以前；比…早些；与其…
adv. 先前，从前；在前，在前方
中文词源
before 在前
前缀be-, 强调。fore, 前面的。
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