On the way, he spoke to us in a perfect native Tianjinese accent. We mentioned Mr.Chern, and he reacted at once --

"Chen Shengshen? A great mathematician, wonderful! Every Tianjinese who has ears knows him! What a talent he is!"

In "at once -- ", I used "--", not "-". Is it okay?
By the way — did you want to say 'what a talent he is', or 'what a talent he has'?

This is an interesting series of posts. I'm looking forward to finding out more about Mr C.

Hello Jobb

The dash ('em dash') is slightly longer than the hyphen, so if you're unable to do a dash, it's better to do a double hyphen than just one hyphen.

You can do an 'em dash' on your keyboard by holding down ALT while typing 0151 on the number pad, thus: —

(Some people say this isn't a proper 'em dash', as an 'em dash' should be the width of the letter M in the font used.)

You can do an 'en dash' by holding down ALT while typing 0150 on the number pad, thus: –

An 'en dash' is slightly longer than a hyphen (properly, it = the width of the letter N in the font used), but shorter than an 'em dash'. It's mostly used to denote range, e.g. pp137–8, 1939–45.

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You've reminded me of that.
 MrPedantic's reply was promoted to an answer.
Would it be better if you put "the" instead of "a"?
"Chen Shengshen? The great mathematician, wonderful!
Students: We have free audio pronunciation exercises.
The forum doesnot offer the function of PM, or I'd send the article.