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(xiàn)性方程組的消元法中，主元素指在某步消元時(shí)模最大的那個(gè)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.
沉積巖的主元素和特征微量元素地球化學(xué)研究表明，該礦床形成于活動(dòng)大陸邊緣的局限裂陷海盆環(huán)境。
