The letter should introduce yourself, explain about your practice, and attempt to establish a reciprocal relationship.

信中应介绍自己，说明你的做法，并试图建立一个互惠的关系。

youdao

The letter should introduce yourself, explain about your practice, and attempt to establish a reciprocal relationship.

信中应介绍自己，说明你的做法，并试图建立一个互惠的关系。

youdao