Nigrifies
vt. 使…成黑色；变黑
🗣️ 情景例句
It's mostly young people who take part.
参加活动的绝大多数是年青人。
You're very cheerful today.
你今天很快活。
It can take as long as eight days to rig up rope ladders and to establish supply bases before a descent can be made into a very deep cave.
有时需要花费整整8天时间来搭起绳梯，建立供应基地，然后才能到一个很深的洞穴里。