每个组进行三项测试——前测、后测以及两项测试后紧接一周的测试。
Each group was given three tests - a pretest, a posttest, and a test a week after the first two tests.
在2009年，美国宇航局将完成一项测查，旨在精确查明90%直径大于等于1000米、存在潜在威胁的近地球星体。
By 2009 NASA will complete a survey meant to pinpoint 90% of all potentially threatening near-Earth objects that are 1km or more in diameter.
海森堡测不准原理是一项基本自然法则，可运用到计算其它变量的共轭对上，比如能量和时间。
The Heisenberg uncertainty principle is a fundamental principle of nature, and applies to the calculations of other conjugate pairs of variables, such as energy and time.
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