sister-in-law

n．(复 sisters-in-law)配偶的姐妹；兄弟之妻

sinlessness, sinner, Sino- (also sino-), sinologist, sinology, sinuosity, sinuous, sinus, sinusitis, sip, siphon, sir, sire, siren, sirloin, sirocco, sirup, sisal, sissy (also cissy), sister, sisterhood, sisterly, sit, sit down, sit down on, sit for, sit in, sit on, sit up, sit up (and take notice), sit-down, sit-in, sitar, sitcom, site, sitter, sitting, sitting member, sitting tenant, sitting-room,