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Expression
垫底儿diàn dǐ r
be the poorest(lowest; bottommost);be the worst one
我知道你们的数学都比我强。我担心我将是垫底儿的。
I know you are all better than me in mathematics. I’m afraid that I’m the worst.
base; take responsibility; support
有他垫底儿,你还担心什么!
You needn’t worry, he will take responsibility.

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