句式“when it comes to.”中的“it”必须有指代的内容吗?

英语高手请进when it comes to ...people's opinion differ.本句的其它句式有多少 when it comes to 加动名词吗 When it comes to engines. 请问when it comes to When it comes to sb/sth的中文意思 英语翻译when it comes to 一般在什么时候用的 when it comes to的英文解释是什么? when it came to 和when it comes to 意思一样吗? when it comes to 能用过去时吗?when it came to? when it all comes down to When it comes to doing business When it comes to computers什么意思