thinic沙丘群落的thinadj.薄的；瘦的；稀的thinner thick seam较薄厚煤层Thin-long shafts细长轴thin concrete lift薄层浇筑thinly-populated人口稀少的thin plate marking薄板标志thin elastic plate超薄单层介质thin on the groundadj.稀少thin route traffic稀路由通信业务量thin route service稀路由业务thin route circuit稀路由电路