下一个领域是更正式的数学和语言领域。
The next area had to do with the more formal areas of MATH and LANGUAGE.
但是当他们和朋友谈话的时候，则较喜欢使用非正式的语言。
But they prefer informal language when they talk to friends.
研讨会将英语和汉语作为正式语言。
English and Chinese are the official language of the symposium and workshop.
研讨会将英语和汉语作为正式语言。
English and Chinese are the official language of the symposium and workshop.
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