科学家和商业人士对养活世界有所警觉，这一点儿也不奇怪。
It is hardly surprising that scientists and business people are raising the alarm about feeding the world.
每天早晨8点以后的两个小时里，志愿者们要做为时30分钟的神经行为测试以检测其精神警觉性和清醒程度，其中包括10分钟的精神警惕性实验（检测注意力和反应时间）。
They included a 10-minute "Psychomotor Vigilance Test" that monitors attentiveness and reaction times.
在中午和下午6点，研究者测量两组人在以下测试中的表现——面部记忆测试、手指敲击记忆测试和警觉性测试。
At noon and 6 p.m., researchers measured how both groups performed in facial memory tests, finger tapping memory tests and an alertness test.
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