英和和英

unaffected by time

for an indefinite time

have not been set；has not been set

no settings

not set up

time of a change

at a predetermined time

to change as time goes by

the number of occurrences within a given time period

uncertain times

an interval of time

the irreversibility of time

regulate or set the time of

elapsed time

since a specified time

not having time to spare

to value time

an arrangement of events in time

the usual fixed time

the usual fixed time

no settings

time of exchanging things

the imperfect tense

the imperfect tense

an unbroken chronological sequence

an unstable order

an undefined term

an independent variable

Hasn't been decided

the counting continued for several hours