介词 - 持续时间和重复介词

used to indicate a temporal interval or a period of time during which an event or action occurs

used to express that something happens continuously from the beginning to the end of a period of time

used to indicate a time duration

used to indicate that something happens within a certain amount of time

before a specific period of time passes

during a particular period of time or while something is happening

used to express the duration of an action or state

during the whole period of time of something

up to a particular event or point in time

used to show that something continues or lasts up to a specific point in time and often not happening or existing after that time

used to describe a specific point or period of time that extends until a certain moment or event

used to indicate continuous or sequential occurrence of an action or event

used to indicate one following another in an unbroken series