时间 - Frequency

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

at any given hour, particularly a time that is late

used for referring to a frequent change from something to another

nearly all the time

in a way that is not continuous or regular

时断时续, 偶尔

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

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

in a single action, without delay or hesitation

in a manner that is consistent

on multiple occasions

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