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。
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。
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。
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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