by
used to indicate the deadline or point in time at or before which an action or event is expected to occur or be completed
通过
[介词]
down
used to indicate that something has happened or existed throughout a long period of time
往下
[介词]
in
used before a specific period of time to show when or at what time something happens or how long it takes for it to happen
在
[介词]
as of
used to indicate a specific point in time or a reference point from which information or a situation is being considered
作为
[介词]
in the course of sth
referring to the period or duration during which something happens, develops, or takes place
中
[介词]
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