Antithyroid drugs may influence the efficacy of 131i, the possible mechanism might be that antithyroid drugs change the effective half-time and (or) uptake of 131i.

抗甲状腺药物影响131i疗效的机理可能在于改变了131i的有效半衰期和(或)甲状腺对131i的摄取率。

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So far it has proven effective at preventing the disease in half of those vaccinated which is more than ever before.

VOA: special.2009.12.07

The vaccine has already proven effective at preventing the disease in half of those vaccinated which is more than ever before.

VOA: special.2009.12.22

But recent findings suggested that tPA may be effective in saving brain tissue even if three to four and a half hours have passed.

VOA: special.2009.09.22

And researchers and Wall Street analysts have had another reason for viewing it as an also-ran: It is only half as effective as torcetrapib, boosting HDL by only 30%.

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But one of the most effective workouts takes less than half an hour.

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Fly-half Arlidge was highly effective with kicks out of hand, but had an off-day in front of the posts, failing with his conversion attempt of Fussell's try.

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