连词 - 数列连词

earlier than a particular action or event

在...之前

used to say that something will happen, when another thing has been concluded

在...之后

used to indicate that something will happen immediately after a certain condition or event occurs

一旦

up to the point in time or the event mentioned

直到

as soon as, immediately after

立即之后

used to indicate that an action or event follows another one without delay or hesitation

立即

used to indicate that something occurs immediately, without delay or hesitation after something else

立刻...时

immediately after this; because of something mentioned

于是