将出生后雄性RCS 大鼠48只随机分为给药组和对照组。
Methods A total of 48 male RCS rats were randomly divided into treated and control groups.
但是，只随机获取地形类型并放入数组中，我们将得到一个不怎么好的结果。
But we will get poor results by just picking the terrain types randomly and shoving them into arrays.
这意味着研究人员可能会决定只观察在每20分钟内随机分布的15秒间隔。
That means the researcher might decide to observe only during 15 second intervals that are randomly distributed within each 20 minute period.
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