【化】 glycidic acid
annulus; hem in; link; loop; ring; surround
【计】 ring up; toroid
【化】 ring
【医】 annuli; anulus; band; circle; circulus; cycle; cyclo-; gyro-; loop; orb
ring; verge
oxygen
【医】 o; O2; oxy-; oxygen; oxygenium; phlogisticated gas
【化】 metacetonic acid; methyl acetic acid; propanoic acid; propionic acid
pseudacetic acid
【医】 propionic acid