occurs
[ə'kɜ:z]
v.
发生( occur的第三人称单数 );
被想起;
被发现;
（尤指基督教节日与别的节日）适逢同日;
例句:
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Conception occurs when a single sperm fuses with an egg.
当一个精子和一个卵子结合时受孕就发生了。
来自柯林斯例句
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Occasionally, this sensation also occurs in the arms.
来自BBC
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If a crime occurs then there is, ipso facto, a guilty party.
如果犯罪发生了，那么根据事实本身，就会有有罪的一方。
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It occurs in elderly men, apparently as part of the ageing process.
这种情况出现在老年人当中，显然是衰老过程的一部分。
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Leprosy occurs twice as often in men as women.
来自BBC
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Everything occurs because it is a reaction to something.
来自SA