1. The use of "their" to refer to a single person is considered a solecism in English grammar.
在英语语法中，用"their"来指代单个人被认为是一种错误用法。

2. His frequent mispronunciations and grammar mistakes mark him as a linguistic solecist.
他频繁的发音错误和语法错误显示他是一个语言错误使用者。