natural unit的用法和样例：
例句
- The thoughtful reader might propose the change of the electron as an obvious candidate for the third natural unit.
善于动脑筋的读者，可能提出电子的电荷作为第三个自然单位的明显的候补者。 - A deeper understanding of submicroscopic nature awaits the discovery of another natural unit, possibly a fundamental length.
对亚微观世界进一步的了解，可望发现另一个自然单位，这可能是一个基本长度。
