brown-ring test

例句：

1. 1. The brown-ring test is a method for determining the age of a plant by measuring the amount of chlorophyll in its leaves.
   棕色环试验是一种通过测量植物叶子中的叶绿素含量来确定植物年龄的方法。
2. 2. During the brown-ring test, the plant's leaves are placed in a solution that causes them to turn brown.
   在棕色环试验中，将植物的叶子放入一种溶液中，使其变棕。
3. 3. The results of the brown-ring test can be used to determine the health and growth potential of the plant.
   棕色环试验的结果可以用来确定植物的健康和生长潜力。