1、笔友英文：penfriend； 2、例句：建立笔友会是为了促进友谊。 The penfriend society has been set up for the purpose of promoting friendship. 3、重点词汇：friend。意思是：n．朋友；支持者；友人；vt 与……为友。 例句：Mr.Green has been a friend of community...