Pentaborate
五硼酸盐
🗣️ 情景例句
Smokers pollute the air.
吸烟污染空气。
A new bicycle is out of the question - we can't afford it.
买新自行车的事谈不上 —— 我们买不起。
CUSTOMS OFFICER: Are you tourists?
你们是来旅游的吗？