英语语法分析

The combined action degree of fluoride and selenite varied with their different mixture ratios and changed in a regular way.

氟离子与四价硒在不同浓度比例下混合作用，其拮抗作用程度不同，并呈一定规律性变化。

The results showed that the combined toxicities were antagonism in both fluoride and selenite and fluoride and selenate tests.

结果表明，氟离子与两种价态硒的联合毒性都为拮抗作用；

Methods: The Se enriched tea was produced by fertilization of sodium selenite through biological transformation of tea tree in low Se content soil.

方法： 在低硒土壤的茶园施用无机硒肥，经茶树的生物转化，制备富硒茶叶；