Gemmologists
(gemmologist 的复数) n.宝石学家
🗣️ 情景例句
Well, thank you.
好，谢谢。
Have you had breakfast yet?
你吃过早餐了吗？
and at the most critical juncture we took turns in watching that point.
在最紧急的时刻，我们轮流监视那段河流的险情。