Balkstone
含杂质的层状灰岩
🗣️ 情景例句
Would you please hand me your customs declaration form?
请出示您的申报表给我？
No. Can't you see that rocket is almost falling down.
不。你不知道火箭快要倒下来了吗？
In the pioneering days, however, this was not the case at all.
然而，在登山运动的初期，全然不是这种情况。