Design features of language Isl/: a)."slippery":slide=slip=slither,slush=sludge b).“pejorative sense”:slattern=slut(懒妇)， sloppy(脏的)，sly,slovenly(懒散) /sk/shows the contact between surfaces:skate, ski,skin,skim,skid(打滑). -are suggests "big light or noise":blare,flare, stare,glare, -ump suggests something round:plump(丰满的)， chump(厚肉块)，hump,rump,dump,mumps, stump.Design features of language /sl/: a). “slippery”: slide= slip= slither, slush=sludge b). “pejorative sense”: slattern=slut (懒妇), sloppy (脏的), sly, slovenly (懒散). /sk/ shows the contact between surfaces: skate, ski, skin, skim, skid (打滑). -are suggests “big light or noise”: blare, flare, stare, glare, -ump suggests something round: plump (丰满的), chump (厚肉块), hump, rump, dump, mumps, stump