匠韵云舍大气颗粒物污染对土地覆盖变化的响应（四）。

I usually studied about an hour although it is difficult at first, after a period of study that will find a way.After nearly 6 months of study, Every night,I have developed the habit of learning English. I hope I can stick to it and continue to study English.In the end, I would like to thank my English teacher for giving me the help and encouragement in my study.

匠韵云舍固相萃取—超高效液相色谱—串联质谱法检测环境水体中18种农药残留（一）。