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- Result shows that the main reason for serious occurrence of pest and disease on street afforestation trees is the deteriorating of the physic-chemical and biological properties of soil. 结果表明：土壤物理、化学、生物学性质的恶化是长春市街路树木病虫害严重发生的主要原因。
- preliminary condition of serious occurrence 重发条件
- His illness was more serious than the doctor first thought. 他的病较医生原来以为的更严重。
- He came off the bike but nothing serious happened. 他从自行车上摔下来，但没有出什么事。
- Riots are of frequent occurrence in this province. 这省经常发生骚乱。
- Robbery is now an everyday occurrence. 抢劫的事现在每天都有。
- I am pretty serious in what I said at dinner. 我晚餐时说的话是当真的。
- His remark shadowed forth some future occurrence. 他的话预示了今后要发生的事。
- Do you think he is serious about leaving his wife? 你认为他真的想离开他的妻子吗？
- The poor man has a serious disease of the liver. 这个可怜的人患有严重的肝病。
- Stop footling about, we have serious work to do. 别浪费时间了我们还有正经事要做。
- Divorce has become an everyday occurrence. 离婚已成为每天都有的事了。
- The examiner looks very serious. 这个主考官看上去很严肃。
- It is more a made-up story than a real occurrence. 那是杜撰的故事，而不是真实发生的事情。
- He received a serious wound in the battle. 在这次战斗中他受了重伤。
- An eclipse is an unusual occurrence. 蚀是不常见的事情。
- That put us at a serious disadvantage. 这使我们处于非常不利的地位。
- He has serious aspirations to a career in politics. 他有从政的雄心壮志。
- A preceding occurrence, cause, or event. 先前的前面的事件，事情
- Such a serious crime must not go unpunished. 这种严重罪行不可不受惩罚。
