【化】 pentamethylene oxide
oxygen
【医】 o; O2; oxy-; oxygen; oxygenium; phlogisticated gas
oneself; personal
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