偶然发生( hap的过去式和过去分词 );

Whenever she recalls the heart-rending incident that happed long ago, she feels suffocated.
这件伤心的事情已经过去很久了,但每当想起, 她还是觉得心里发梗.
来源:互联网摘选Blowout can happed anytime , so you'd better keep in mind the ways to closest hideouts.
电磁风暴随时有可能发生.
来源:互联网摘选The mine flooding happed during construction of the air shaft in Qidong Coal Mine.
祁东煤矿风井在建井过程中,发生钻井井壁突水事故,井筒被淹.
来源:互联网摘选
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