It's called cDNA or complimentary DNA to indicate that it's a copy, a complimentary copy of the messenger RNA.

它叫cDNA或者互补DNA,意味着它是一个拷贝,一个信使RNA反转录得出的DNA拷贝

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It's the transcribed version of DNA, and it's the exact complement of a particular region of DNA.

它是DNA的转录版本,与特定的DNA序列严格互补

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