no more than 至多,同...一样不
none other than 不是别的,正是
on ones guard 警惕,提防
nothing but 只有,只不过
now and then 时而,偶尔
off and on 断断续续,间歇地
off duty 下班
on a large/small scale 大/小规模地
on account of 由于
on average 平均,通常
on behalf of 代表
on board 在船上
on business 因公
on condition that 如果
on duty 上班,值班
on earth 究竟,到底
on fire 起火着火
on foot 步行,
on guard 站岗,值班
on hand 在场,在手边
on occasion 有时,间或
on ones own 独立,独自
on purpose 故意地
on sale 出售,廉价出售
on schedule 按时间表,准时
on second thoughts 经重新考虑
on the contrary 正相反
on the grounds of 根据,以...为由
on one hand 一方面
on the other hand 另一方面
on the point of 即将...的时刻
on the road 在旅途中
on the side 作为兼职/副 业
on the spot 在场;马上
on the whole 总的来说,大体上
on time 准时
once again 再一次
oncefor all 一劳永逸地
once in a while 偶尔
once more 再一次
once upon a time 从前
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