B2 [ I ] (especially of accidents and other unexpected events) to happen(尤指事故及其他意外事件)发生
More examples
Many suicides occur in prisons.
We are of course investigating how an error like this could have occurred.
Evolution occurs as a result of adaptation to new environments.
Evidence suggests that errors may indeed be occurring.
The partition of India occurred in 1948.
[ I + adv/prep ] to exist or be present in, among, etc.存在;出现
verb
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