principal element的用法和樣例：
例句
- In the elimination method of solving linear equations,pivot in an elimination step is a element with maximum-mod.
在解線性方程組的消元法中，主元素指在某步消元時模最大的那個元素。 - Major and trace element geochemical data show that this deposit was formed in a restricted aulacogen against the setting of an active continental margin.
沉積岩的主元素和特徵微量元素地球化學研究表明，該礦床形成於活動大陸邊緣的局限裂陷海盆環境。
