英语语法分析

Alkenes react with water and halogens to form halohydrins by an addition reaction.

烯烃与水和卤素发生加成反应生成卤代醇。

All the halogens require one more electron to complete a P-shell.

所有的卤素都要求得到一个额外的电子来填满p壳层。

Halogens also have the necessary absorption in the ultraviolet and rapid dissociation.

卤素也具有吸收紫外线和分解快这两种特性。