Zhang Yuyan I am ignorant really, the international seminar that in Switzerland biennially of city of Wen Tetu Er holds, I am not long ago just hears of only.

• 张宇燕我实在是孤陋寡闻，在瑞士温特图尔市每两年召开一次的国际研讨会，我只是不久前才听说。