Man is the measure of all things Instrumental values are easiest to grasp.

人是万物的尺度工具价值最容易掌握。

One little-regarded but important example of instrumental value is the transport of Old World earthworms to North America, parts of which were left worm-free after the last ice age.

工具价值有一个鲜为人知但十分重要的例子，即旧世界蚯蚓入侵北美，自上一个冰河时代后到蚯蚓入侵之前，北美的一部分地区完全没有过蚯蚓的存在。