Patmo
abbr. Patent and Trademark Office 专利与商标办事处
🗣️ 情景例句
Learning to express onself well is an important part of education.
学会把意思表达清楚是受教育的一个重要方面。
I asked him to clean it for me, but he wouldn't.
我请他帮我清理，但是他不肯。
and we have only to turn to that extraordinary discovery of echo-location in bats to see a case in which the voice plays a strictly utilitarian role.
我们只要看一看蝙蝠回声定位这一极不寻常的发现，就可以探究一下声音在什么情况下有绝对的实用价值。