matter
before
Come learn 3000+ Chinese characters with HanziHero!
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in advance
beforehand, prior
请 事先 告诉 我。
Please tell me in advance.
我们 需要 事先 买票 吗?
Do we need to buy tickets in advance?
他 事先 不 知道 这 个 计划。
He did not know about this plan in advance.