The issue of UFO has been a hot discussion, many people believe that UFO indeed exist, while others not.

UFO这个问题是一个热点讨论话题，很多人相信它确实存在，有一些人不相信。

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Some people think it is a good thing to donate blood for it could save somebody's life while others insist that we should not donate blood for it may cause some illnesses.

有些人认为献血是一件好事，因为它可以挽救某人的生命，而其他人坚持认为我们不应该献血，因为这可能会导致一些疾病。

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If not, how do you feel when others do that while having dinner with you?

如果没有，当别人和你一起吃晚饭时，你感觉如何？

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Lincoln had said that the United States could not continue to permit slavery in some areas, while banning it in others.

VOA: special.2009.06.11

But 107 legislators voted against Mr.Orban, while 18 others did not take part in the vote.

VOA: standard.2010.05.29

Retaining DNA from individuals who are not convicted of an offence is as controversial in the US as it is in the UK. Some American states do keep samples from people arrested but not convicted while others do not.

BBC: DNA and individual freedom v crime prevention

Some states recognize licenses from other states in various job categories, while others do not.

FORBES: A Use For The Commerce Clause: Increasing US Labour Mobility Through Occupational Licensing

Some of the mice were put on a swimming regimen, while others did not exercise.

BBC: Exercise is good for health