长见识

hé tā de liáo tiān hěn kuài lè yě hěn zhǎng jiàn shi

和他的聊天很快乐，也很长见识。

His chat is very happy, also opening mental horizon very much.

yī cì jì ráo yǒu qù wèi yòu néng zhǎng jiàn shi de jiǎng zuò

一次既饶有趣味又能长见识的讲座

a very interesting and informative lecture