Islower
判断是否小写字母
🗣️ 情景例句
Catch you later.
以后再聊。
Success grows out of struggles to overcome difficulties.
成功来自于克服困难的斗争。
it can become a 'flying fruit-bowl', carrying bananas from the plantations to the ports;
它能成为飞行水果盘子，把香蕉从种植园运到港口。