时间 - 频率

in way that continues to happen all the time with no stop

一直在发生

at any given hour, particularly a time that is late

不断地

used for referring to a frequent change from something to another

从一天到另一天

nearly all the time

大多数时候

in a way that is not continuous or regular

不规则发生的事情

used for saying that something can only happen on very rare occasions

很少发生的事情

used for referring to a very special opportunity that most likely will not be offered more than once to someone

只发生一次的事情

in a single action, without delay or hesitation

在一个动作中

in a manner that is consistent

一周中的所有时间

on multiple occasions

反复

used to describe something that happens at fixed intervals or follows a consistent pattern without fail

准时