时间 - 跨度和持续时间

from a time that has begun a long ago

从几年前开始

at a point in time as a process or action continues or is being carried out

将来

a work day that is short compared to total hours of most jobs

工作时间短

in the end of or over a long period of time

经过很长一段时间

used to describe a prolonged or indefinite period of time, often implying that something will continue for a very long duration

永远

to last only for a short period of time

used to refer to a long passage of time or a significant number of months or years

经过很长一段时间

at an unspecified point during a series of events or a process

经过一段未指定的时间后

a very prolonged period of time

很长一段时间

used to say that something has existed or been done for an extremely long time, to the point where its origin or beginning is unknown or forgotten

自古以来就存在的东西