区别：come about 与 come up（发生）
问题：come about 和come up都可以表发生有什么区别？回答：
come about
1 to happen, especially by chance:
come about through:
e.g.The increase in production has come about through the use of technology.
come up
1 if a problem comes up, it happens and needs to be dealt with immediately:
e.g.I'm going to have to cancel our lunch - something's come up.
1a. to be mentioned and need to be considered:
e.g.A number of interesting points came up at today's meeting.
1b. to be about to happen soon:
e.g. We've got a busy period coming up in a couple of weeks.
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