事关重大你得三思而行英文是It's very important and you should think twice.
核心短语/词汇：think twice慎重考虑，再三考虑。
解析：根据题干要求，本题需要表达“事关重大，你得三思而行”这一语义。事关重大It's very important，and作为连词，连接并列成份主语you，情态动词should意为“应该”，后跟动词原形，短语think twice，意为“三思而后行，慎重考虑”。
短语think twice是本句理解重点，举例理解。
1. It's a shame. as think we plaved a fine aame and came close to doubling ou
advantage at least twice.
我感到非常遗憾，因为我认为我们踢了一场伟大的比赛，我们有两次绝佳的机会，差一点将领先优势翻倍。
2. But I saw some shit this morninmade me think twice.
但今天早上的一些事让我思考了又思考。
3.To conclude, keep in mind that cosigning a loan is a serious responsibility and you need to think twice before making any deal
总括来说，要记住cosigning贷款，是一个严肃的责任，你必须三思而后行作出任何处理。
4. If I were you I'd think twice about it.
如果我是你我会三思而后行。
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