However, a subgroup who rated echinacea's effectiveness highly on a form at the start of the study — and were given a placebo during the study — had the shortest duration colds.

然而，在研究开始时分发的表格中高度认同紫锥菊疗效、并在研究中得到安慰剂的那组病人感冒病程最短。

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The autotransformer is capable of withstanding surge by25times of rated current for2-second duration without any thermal or mechanical damage.

变压器能够承受25倍额定电流持续2秒钟冲击不会造成自耦变压器的任何热和机械损伤。

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The meows that were rated most pleasant were shorter in duration, had higher frequencies and tended to change from high to low notes.

而那些被评价为最急迫的叫声在时间上持续得较长， 频率较低，经常是从低音开始，逐步上升到 高音。

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You need to go down to single B rated paper with a 10-year duration to obtain a 6.5 percent return.

FORBES: Is Your Portfolio 1961 Ch?teau Latour?

Participants completed a daily diary for the duration of their illness and rated the the severity of their symptoms including cough, shortness of breath, chest pain, and blocked or runny nose.

BBC: Antibiotics 'ineffective for coughs'