ravel
v
(-ll-; US also -l-)
1 [I, Ip, Tn, Tn.p]
~ (sth) (up) (cause threads or fibres to) tangle and become knotted (使线或纤维)缠结.
2 [I] (of woven or knitted fabric) separate into threads; become untwisted; fray (使编织物或编结物)散成线, 绽线
Bind the edge of the rug so that it won't ravel. 给地毯镶个边以免开线. Cf 参看 unravel 1.
We never know the worth (or value) of water till the well is dry.
井枯方知水可贵。
Parents would be greatly surprised and deeply touched if they realized how much belief their children usually have in their character and infallibility,