Polysulfuration
聚硫化作用
🗣️ 情景例句
Different kinds of activities, such as commenmorative meetings, planting trees,
举行各种各样的活动，例如召开纪念大会，植树造林，
He's a dumb guy.
他是位沉默的老兄。
and that is one of the things the young are busily engaged in seeking.
这正是年轻人所热衷追求的。