A sample of a known compound must be utilized in order to assure identification of the unknown compound.

为了确保未知化合物的识别，必须使用已知化合物的样品。

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A sample of a known compound must be utilized in order to assure identification of the unknown compound.

为了确保未知化合物的识别，必须使用已知化合物的样品。

youdao