on duty

on display
on diet
on cue
on credit
on condition that
on duty
on earth
on end
on file
on fire
on foot
on guard
on hand
on instalments
on instinct
on no account
on occasion
on one's guard
on one's head
on one's honor
on one's honour
on one's own
on one's way to...
on order that
on principle
on purpose
on relief
on sale
on schedule
on second thoughts
on the alert

书签在线学习词典

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