Perchloropropane
八氯丙烷
🗣️ 情景例句
No. Instead of exercising, I photographed the class.
没有， 没有， 我在给他们拍照。
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。
Settlers made agreements with Native American cheifs but always broke them afterwards.
殖民者同美洲土著人的首领达成了协议，但是这些协议随后总是被撕毁。