Je was op zoek naar: think thin (Engels - Chinees (Vereenvoudigd))

thin
细

thin film
薄膜

thin needle
细针

single, thin
单，细

thin-clothed
薄衫

thinks thin then thin
想瘦就瘦

rb: well, i think that there's a very thin dividing line between success and failure.
理：这个嘛，我觉得成败仅一线之隔