Question

speak of ;when it comes to有什么区别

speak of ;when it comes to有什么区别

Answer 1

speak of，完整的写法是，to speak of，＝ worthy of mention，值得一提。
when it comes to，＝ as for something; speaking about something，说到某事的时候。－－ speak of是内容有让人感兴趣的地方；而when it comes to，也许内容并不吸引人，但（不得不）说到，或者话题正好提到了，可能是被动，可能是碰巧，也许是内容使然。。。

There is a pretty good news to speak of。 好消息，值得一提。
When it comes to trouble, he really knows how. 要说麻烦，他是再清楚不过了。