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词语事先拆分为汉字：
事字的拼音、笔画、偏旁部首、笔顺、繁体字，事字字源来历，事字演变
自然界和社会中的现象和活动：～情。～件。～业。变故：～故（出于某种原因而发生的不幸事情，如工作中的死伤等）。～端。职业：谋～（指找职业）。关系和责任：你走吧，没你的～了。办法：光着急也不是～儿，还得另找出路。做，治：不～生产。无所～事。服侍……
先字的拼音、笔画、偏旁部首、笔顺、繁体字，先字字源来历，先字演变
时间在前的，次序在前的，与“后”相对：～前。～期。原～。～驱。～河（中国古代帝王先祭黄河，后祭海，以河为海的本源，后称倡导在先的事物）。～觉（jué）。～见之明。～发制人。家族或民族的较早的一代或几代：～人。～世（祖先）。～民。对死去的人的……
汉语拼音：shì xiān
Follow your heart and choose the steps that you know in advance are the right actions for the amount of energy you have right now.
扪心自问，选择那些你事先会知道适合当前精力的行动。It was a pre-recorded sequence that had already been heard by the programme editor (a BBC veteran, aged 25), and a senior colleague.
这是一个事先录制好的节目，已通过节目编辑（一名BBC老手，25岁）和一名高级主管的审核。Before I made another trip to Taiwan, we planned ahead, making sure that she was not going to travel and I was to stay for more days.
在我又一次去台湾之前，我事先打了电话，以确信她没有外出，同时我也准备多呆几天。If your attention is elsewhere, you may not notice these signals and so when the cat bites, it certainly appears as if there was no warning.
如果你的注意力在别处，也许就不会注意到这些信号，所以当她咬你时，就肯定会好像没有事先警告一样。Others also bought the ~ end of the introductions failed, after a month in advance to see it all go short, and I did not think of.
也是他人引见才买的~末尾不成，事先都过了一个月才看进去淡了，我自己都没想到。Before he went to the store, he took careful measurements of his feet and noted the dimensions on a piece of paper.
他事先在家里量好双脚的尺寸，把它记录在纸上。Had his owner known more about dogs' true nature, he might have introduced the new dog more gradually, or not at all.
如果狗主人事先摸清了狗的本性，他可能会时不时地带回新狗，要么干脆不带。Itmust also be able to reach Alice or Bob anywhere they may happen to be, supposedly not in a predefined place.
它也必须能接通到任何爱丽丝和鲍勃可能出现的地方，假设这些地方都不事先设定。Not even a few seconds of your 15 minutes must be wasted starting to read. Set that book out in advance.
这15分钟当中哪怕只有几秒钟用来准备读书都是浪费，事先做好阅读的准备。