Fluorid
n. 氟化物
🗣️ 情景例句
We are very pleased with our presend arrangements for printing and definitely will not be considering any other services in the foreseeable future.
在今后的一段时间内我们不会考虑其他的服务提供者。
I'll pick up the tab.
我来付帐。
they can locate and steer clear of obstacles -- or locate flying insects on which they feed.
并能通过回声来确定并躲开障碍物，或找到它们赖以为生的昆虫。