These roles represent who is responsible for implementing the specific activity.
这些角色代表了谁负责实现特定活动。
A period of time devoted to a specific activity.
一段时间：完全专注某活动的一段时间。
These phytases have an improved specific activity.
这些肌醇六磷酸酶具有改进的比活性。
It's an innate ability to do some specific activity especially well.
它只是一种与生俱来的能力，可以让人把某件事做得特别好。
It's an innate ability to do some specific activity especially well.
它只是一种与生俱来的能力，可以让人把某件事做得特别好。
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