The quantity of cars increases several thousand per day.

作为一个中国人，我都不知道你想说什么。。。。 每天汽车yi ji qian liang 速度递增。什么意思？直接说中文吧。。。

Oh please type Chinese. We can't understand Pinyin.

are you trying to say: "automobiles increase at a rate of several thousands everyday" try typing Chinese instead of pinyin. good luck