Oeo
abbr. 经济机会局（Office of Economic Opportunity）
🗣️ 情景例句
Nope.
没有。
Did you go swimming yesterday?
你昨天去游泳了吗？
So was born the echo-sounding apparatus, now in general use in ships.
这样就产生了目前各种船舶上普遍应用的回声探测仪。