sample tree

例句：

1. 1. The scientists used a sample of soil to test the effects of fertilizer.
   科学家们用土壤样本来测试肥料的效果。
2. 2. The museum has a collection of samples from around the world.
   博物馆收藏了来自世界各地的样本。
3. 3. The scientist collected samples from different parts of the forest.
   科学家从森林的不同部分收集了样本。