thinium沙丘群落thinadj.薄的；瘦的；稀的thin-shell aqueduct薄壳渡槽thin-plate specimen薄板试件thin electrolyte film薄液膜thinwalled insulation薄壁绝缘; 薄层保温Thin film evaporators薄膜蒸发器thin-layered method薄层法thin-film thickness薄膜厚度thin out of coal seam煤层尖灭thin-film in optics光学薄膜thin multiculturalism薄的文化多元主义