I do it when I am home, and when on the road.
我在家的时候是这样，我不在家的时候也是如此。
Although the risk is small, use caution when on any unfamiliar network.
尽管风险很小，但是请谨慎使用任何不熟悉的网络。
By contrast, I, like most of you, am an impatient Westerner, even when on holiday.
与他们形成对照的是，我，像你们大多数人一样，是一个没有耐心的西方人，甚至在度假的时候也是这样。
I make the acquaintance of Tom when on holiday in Spain.
我是在西班牙度假时结识汤姆的。
Young people should offer their seats to the old when on a bus.
年轻人给老人让座，这是应该的。
Act as a member of obligatory fire brigade when on duty.
当班时应为义务消防队的一员。
The boy often goes hungry when on his own because he can't cook.
这个小男孩独自一人时往往会挨饿，因为他不会做饭。
Walk as closely to the wall as possible when on damaged stairs and upper floors.
在损坏的楼梯或楼层上，尽量靠墙走。
There's nothing better when on holiday than to take the air before breakfast each day.
在假日里没有什么比每天早饭前到户外去散散步更好的了。
When on earth can he cry once?
他究竟什么时候才会哭一次呢？
When on earth did I have a son?
我究竟什么时候有的儿子呢？
你们究竟是几点睡的？
When on holiday, I just want to relax.
放假的时候，我只想放松一下。
When on earth did you send the email to him?
你究竟是什么时候发电子邮件给他的？
When on earth are you going to get down to writing?
你到底打算什么时候开始写？
When on stage, try not to turn your back to the audience.
在舞台上时尽量不要背对观众。
When on board, I like to kill time by reading detective stories.
乘飞机时，我喜欢读侦探小说借以消磨时间。
When on night shift, check night reports, prepare the morning report.
夜班时，检查夜间报告，准备早间报告。
There are occasions when (=on which) one must yield.
任何人都有不得不屈服的时候。
The last day when (= on which)I saw her was a fine morning in July.
我见到她的最后那天是七月份的一个阳光明媚的早晨。
I'll never forget the day when [on which] we first met.
我永远不会忘记我们第一次见面的那一天。
I'll never forget the day when [on which] we first met.
我永远不会忘记我们第一次见面的那一天。
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