Chemically pure
[化] 化学纯
🧩 词语组成解析
adv. 用化学, 以化学方法
🗣️ 情景例句
who spent the last five years
用过去五年的时间
And trade terminology in English is helpful in actual business negotiations.
对于实际的商务谈判是非常有用的。
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。