| on display/show 展出，陈列 |
- This is the best dress on display / on show. 这是展出的最好的衣服。
- There was also a great deal of machinery on display.
- The most wonderful piece of machinery on show.
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| on business 因公（与 for pleasure 相对） |
- Last month he went to New York on business and had little time to visit friends.
- He has gone to Frankfurt on business.
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| on foot 步行（与 by bus，by car，by air 等相对） |
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| on duty 值班，值班的 |
- It was Sunday and there was only one doctor on duty.
- I asked to see the officer on duty.
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| on the whole 总的看来，总的来说，大体上 |
- On the whole, he is a hard-working student.
- On the whole, it has been a very successful year.
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| on fire 起火，着火 |
- Soon the whole building was on fire.
- Look at that smoke. That building must be on fire.
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| on purpose 故意地，有意地，特意地（与 by chance 相对） |
- They have come here on purpose to see you.
- She broke the vase on purpose.
- I don' t think it was an accident. He did it on purpose.
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| on the average 平均，通常 |
- On the average, he works more than ten hours a day.
- On the average, I make six telephone calls a day.
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| on any account 无论如何，不管怎么说（通常用否定句） |
- Do not interrupt him on any account.
- You mustn’t on any account sign the contract before you read it.
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| on second thought(s) 经重新考虑后（thought 用单数或复数均可） |
- I intended to go to the party, but on second thought(s), I decided to stay at home.
- I know I had agreed to let you go to the cinema, but on second thoughts, you should stay at home and finish your homework.
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