许多试验都失败了，但它们已经在火车、航空、出版、可乐等领域做起了生意。
Many experiments have failed but they have established businesses in areas such as trains, airlines, books, cola, etc.
尽管许多研究都已经表明，但还缺少随机临床试验的佐证。
Although numerous studies have been promising, there are scant data from randomized clinical trials.
经过短短的一两个试验，许多蜜蜂已经学会在期盼已久的含糖微滴前吐出舌样长鼻。
After only one or two trials, many bees learned to stick out their tonguelike proboscis in anticipation of a sugary droplet.
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