biuret

例句：

1. 1. The biuret test is used to determine the presence of proteins in a sample.
   双缩脲试验用于确定样本中的蛋白质存在。
2. 2.The biuret test is a simple and reliable method for detecting proteinuria.
   双缩脲试验是一种简单而可靠的方法，用于检测蛋白尿。
3. 3. In the biuret test, a solution of copper sulfate and sodium carbonate is added to the sample, which reacts with the protein present to form a blue precipitate.
   在双缩脲试验中，向样本中加入硫酸铜和碳酸钠的溶液，与存在的蛋白质反应形成蓝色沉淀。