stern

a.严厉的，严苛的

stepfather, `stepmother, stepparent, steppe, stepping-stone, stepson, `stepdaughter, stereo, stereo-, stereophonic, stereoscope, stereoscopic, stereotype, stereotyped, stereotyping, sterile, sterility, sterilization, sterilization, sterilisation, sterilize, sterilize, sterilise, sterling, sternly, sternness, sternum, steroid, stertorous, stertorously, stet, stethoscope, stetson, stevedore, stew, steward, stewardess, stewardship, stewed, Sth, stick, stick (sth) out, stick at sth, stick by sb,