贩卖毒品罪除了不能犯的未遂外，行为犯的未遂只能存在着手未遂的情况。

Except for the attempted crime of traffic in drugs that cannot be offend, the attempted act offence is just in the situation of the attempt that is being accomplished.

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贩卖毒品罪中的卖出行为本质上以买卖关系为基础，互易毒品行为与之存在着性质差别。

Essentially, the act of drug-selling in the crime concerning drug trafficking is a form of trade, which is much different from the notion of drug exchange in the nature.

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