Because a new study suggests that humans can make their own salicylic acid, which forms the bulk of aspirin's active ingredient.

因为一项新的研究表明，人类可以自己生成水杨酸，水杨酸是构成阿司匹林的大量活性成分。

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My insomnia is caused by a very active mind since the bulk of the food does not go to the right places.

我的失眠是由于我有非常活跃的思绪，而这么多的资料没有到达它们该到的地方。

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The results show that the reactivity and the amount of hydrogen absorption in the HD process are related to the surface activity of the bulk alloy so that fresh active bulk has higher efficiency.

结果表明氢爆碎的吸氢速度和吸氢量与钕铁硼合金铸锭表面的活性有关，表面新鲜、活性大的合金铸锭氢爆碎的时间短、效率高。

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Indeed, a deal would bulk Virgin Active up to four times its current size.

FORBES: Branson To Muscle In On U.S. Gym Chain?

The company ships active ingredients in bulk to generics heavies such as Teva and Ivax.

FORBES: Pill Factory to the World