🧩 词语组成解析
poor
[pʊr]
adj. 贫穷的,贫乏的;令人怜悯的,可怜的;匮乏的;低劣的;
n. the poor 贫困者,穷人;
n. 拼字者, 缀字课本
🗣️ 情景例句
Littering is a serious offense in some countries.
乱扔垃圾在某些国家是严重的违法。
The snake curls up.
蛇盘成一团。
This depends on the precise radio frequency of the 21-cm wavelength, or 1420 megacycles per second.
这种通讯联系要靠21厘米波段,即每秒1420兆周的精确无线电频率。