测绘之路

看了一天的PSINS源码,脑袋都快炸了,但是仍然没看懂,我去,还要自己写函数,不会啊。晕死了。

Today,I was chatting with a girl.She is a gentle one.😊

It's difficult to prove definite integrals in exam math, so I have a long way to go, so I'll mull it over tomorrow.