Bluestone
n. 硫酸铜, 胆矾\\n[化] 胆矾; 蓝灰砂岩
🗣️ 情景例句
Couldn't agree more.
绝对同意。
Who is the president of this republic?
谁是这共和国的总统？
It is only 380,000 kilometres away, and it has been visited by man already.
已经有人到过月球旅行了。