stethoscope

n. 听诊器

stereoscope, stereoscopic, stereotype, stereotyped, stereotyping, sterile, sterility, sterilization, sterilization, sterilisation, sterilize, sterilize, sterilise, sterling, stern, sternly, sternness, sternum, steroid, stertorous, stertorously, stet, stetson, stevedore, stew, steward, stewardess, stewardship, stewed, Sth, stick, stick (sth) out, stick at sth, stick by sb, stick insect, stick out, stick out for, stick shift, stick sth down, stick sth in/into sth, stick sth on (sth), stick to,