并没有规定说，你必须礼貌地等待，直到有人来点你的名问你对某事的意见。
There's no rule that says you politely have to wait for someone to directly address you and ask your opinion on something.
当你表达对某事的意见或者解释某事的原因时，你经常可以用because/因为，例如I think it’s because .
When you give an opinion about something or a reason for something, you often use because / because, e.g.
意见是某人对于某件事的观点或想法，它是对某事的估计，判断或是评价。意见不等于事实，因为意见既没有被证伪，也没有被确认或证实。如果随后它被确认或证实了，它就不再是一个意见，而成为了一个事实。
It is an assessment, judgment or evaluation of something. An opinion is not a fact, because opinions are either not falsifiable, or the opinion has not been proven or verified.
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