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Vaccines work by activating the immune system .

疫苗通过激活免疫系统发挥效用。

By activating the central nervous system , caffeine boosts arousal and alertness .

通过激活中央神经系统，咖啡因能提高唤醒度和机敏度。

Application of activating circulation to remove blood stasis in geriatrics .

活血化瘀在老年病治疗中的运用。

Ubiquitin activating and conjugating enzymes and related proteins .

泛素活化、结合酶以及相关蛋白。

But executives at other top oil companies privately conceded they were activating emergency plans to repatriate all their staff and shut down output .

但其它主要石油公司的高管们私下承认，他们正在启动疏散全体员工、关闭生产的应急计划。