Islower
判断是否小写字母
🗣️ 情景例句
Study hard kids, your mother and I want you to get into a good college when the time comes.
努力学习，孩子们，你们的妈妈和我希望你们能考上名校。
To sleep like a baby
睡得像个婴儿
There was no electricity in my dorm last night.
昨晚我宿舍没电。