肽是一类由氨基酸构成，但又不同于蛋白质的中间物质，这类具有蛋白质特性的物质便是活性肽。

Peptide is a kind of amino acid from the composition, but different from the middle of protein substances, such a protein characteristics of the material is active peptide.

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“我们已经证明，在不使用一种我们还不知道的中间物质情况下，TRAILT蛋白本身可以用于药物输送系统附加到癌细胞，”顾说。

"We've demonstrated that TRAIL itself can be used to attach a drug delivery system to a cancer cell, without using intervening material - which is something we didn't know," Gu says.

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通常地，虽然，你或许,停在中间的某个位置,在两相中都有适量的物质，你想,找出每一相的组成。

Typically, though, you might stop somewhere in the middle and have some reasonable amount of material in both phases, and you want to find out the composition in each phase.

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