Problem child
[法] 问题儿童, 难管教的儿童
📖 牛津释义
problem child
child who continually behaves badly, does not learn well, etc 有问题的儿童（一贯行为不端、 功课不佳等的）.
🧩 词语组成解析
child
[tʃaɪld]
n. 小孩，孩子;幼稚的人;产物;弟子;
🗣️ 情景例句
They're the ones.
找他们没错。
I wish to express my gratitude to you for your cooperation.
我要对你的合作表达感激之意。
First of all, it's been improved. And it's bigger, although it's more expensive.
首先，它已作了改进。而且机子较大，尽管价格贵些。