occasion

1.[c]某次；…的时候a particular time when sth happens

2.[c]特别的事情（或仪式、庆典）a special event, ceremony or celebration

3.[sing]~ (for sth/doing sth)适当的机会；时机a suitable time for sth

4.[u][sing]理由；原因a reason or cause

on occasion(s)

偶尔；偶然；有时sometimes but not often

1.使发生；造成；导致to cause sth

1.(庆祝等的特殊)场合;(重大)时节,时刻

2.机会;(适当的)时机;好机会

3.(怒,笑等的)根据,理由,必要

4.〈古〉事,事务,工作,职业

5.原因,诱因,近因

1.惹起,引起

1.a time at which something happens; an appropriate time for something; a special or important time or event

2.a reason for something; a cause of something

1.to cause something