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1·Does life exist on Mars?

有生命存在火星上吗？

2·Though one should have dreams, it's not realistic to exist on dreams.

尽管人应该有梦想，但是依靠梦想生活也不现实。

3·These rules provide more detailed information about the relationships and restrictions that exist on the columns of a nickname.

这些规则提供了更详细的信息，是关于存在一个昵称各个列的关系和约束。

4·Does life exist on other planets?

其他行星上有生命吗？《牛津词典》

5·They can't exist on the money he's earning.

他们靠他挣的那点钱无法维持生活。《牛津词典》

6·Some people exist on melons or coconuts for weeks at a time.

有些人一度数周靠各种瓜与椰子生存。《柯林斯英汉双解大词典》

7·Although it is possible to exist on traveler's cheques, Eurocheques and credit cards issued by British banks, the fees for these services can be expensive.

虽然可以通过旅行支票、欧洲支票和英国银行发行的信用卡使用，但这些服务的费用可能很昂贵。

8·Pandas exist on a bamboo diet.

而熊猫主要是吃竹子的。

9·The DSN does not exist on the server.

DSN在服务器中不存在。

10·The tables must already exist on the target.

这些表必须已经在目标数据库中存在。