at random

• Soiled dishes were piled at random
  脏碟子胡乱地堆放着。
• Mutual funds never invest at random , and neither should you
  共同基金从来不会随意投资，你也不应该那样做。
• Soiled dishes were piled at random
  脏碟子胡乱地堆放着
• Please choose a number at random
  请随便选取一个号码
• He sometimes just opened the book at random , without any definite purpose
  有时他只是毫无目的地随意翻开书本。
• He opens the book at random
  他随意打开了这本书。
• He took a book at random
  他随意地拿了本书
• Or if you need current data , select a black family at random
  或者如果你需要比较新的资料,那就随便挑选一个黑人家庭问问
• A jar will be picked at random , and then a marble will be picked from the jar
  随意拿起一个罐子，然后从里面拿出一个玻璃球。
• When his wife was away ， he piled the soiled dishes in the kitchen at random
  他妻子外出时，他把脏碟子乱七八糟地堆在厨房里。