on and off

on an even keel
on an average
on account of
on a weekly (daily basis)
on a small scale
on and off
on average
on balance
on behalf of
on board
on business
on condition that
on credit
on cue
on diet
on display
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

书签在线学习词典

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