pre
abbr.
prefix 前缀（计算机字符）;
(Latin prefix=before) （拉丁语前缀）在…之前;
precursor 前体细胞;
partial reinforcement effect 局部加强作用;
例句:
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The subject came up during a pre-dinner drink with our guests.
在与客人喝餐前酒的时候，有人提到了这个话题。
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Whether it was pre-meditated, we don't know.
来自BBC
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Children graduate to the kindergarten, then pre-school, and then school.
孩子们先上幼儿园，然后上学前班，再接着上小学。
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There is also an option to edit pre-existing objects.
来自BBC
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Most pre-prepared weight loss products are next to useless.
大多数预制减肥产品几乎都没有什么功效。
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I've imposed the curfew as a pre-emptive measure.
来自BBC