These trials will give a better idea of the number of doses required for a person to be immunized, as well as of the quantity on active principle (antigen) needed in each vaccine dose.

通过这些试验，将能够更好地了解一个人需要多少剂疫苗才能获得免疫，以及每剂疫苗中必须含有多少有效成分(抗原)。

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Yesterday, she explained the dichotomy between the active principle of yang and the passive principle of yin.

昨天她解释了‘阳'的主动原则与‘阴'的被动原则之间的本质对立。

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Objective To study the anti HBV effect of the active principle of Styelec plicata in vitro.

目的研究皱瘤海鞘有效部位的体外抗乙型肝炎病毒(HBV)的作用。

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Most of the few existing assisted-suicide laws rely on the principle of active and informed consent to a procedure that may, or will, lead to death.

ECONOMIST: The right to choose to die

David McNair, senior economic justice adviser at the charity Christian Aid, says tax havens are used in a variety of ways, but the general principle - for a business active in a number of countries - is to maximise the amount of profit made by subsidiaries based where taxes are low, at the expense of those based where taxes are high.

BBC: Tax havens: Is the tide turning?

Engineered geothermal systems (EGS) are based on a related principle, but they work even in parts of the world that are not volcanically active, by drilling thousands of metres underground to mimic the design of natural steam or hot-water reservoirs.

ECONOMIST: Inside story: Hot rocks and high hopes | The