Opencut
a. 露天开采的
🗣️ 情景例句
I always mix up these two words.
我老是把这两个词搞混。
How much is it by air mail?
航空信要多少钱？
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。