Gemmologist
n. 宝石学家
🗣️ 情景例句
He is not very interesting to talk to.
跟他谈话没味道。
When I slept, he was out.
当我睡了时候，他外出了。
But instruments far more delicate than that were needed if any really serious advance was to be made.
但是，如果要取得真正重大的进展，需要有比这种装置精细得多的仪器。