at random

I admire those who are in love on campus and at the same time I felicitate myself on not choosing at random.

我羡慕那些拥有校园爱情的同学，也为我自己的宁缺勿滥喝彩。

The coiled shapes of Trichinella isolated ML were observed under microscopes,then the lengths and widths of ML encystment(encysted index)were measured at random by micrometer.

镜下观察旋毛虫幼虫卷曲状态,用测微尺随机测量囊包长、宽。

At the Gallup Organization we recently focused in depth on success, probing the attitudes and traite of 1500 prominent people selected at random from Who’s Who in America.

Here are five of the most important:在洛普组织，我们近来深入集中研究了成功问题，在美国《名人录》中随机选择了1500名杰出人物研究他们的态度和性格特征。