除非被逼迫，他坚决拒绝说英语。
He resolutely refused to speak English unless forced to.
这个概念难以用英语来表达。
It's a concept that is difficult to render into English.
这是学英语的人常犯的错误。
It's a common mistake among learners of English.
在这方面法语和英语不同。
French and English differ in this respect.