【化】 pericyclic reaction
all; all over; circuit; circumferenc; cycle; thoughtful; week
【计】 REV
【化】 peri
【医】 para-; peri-; perimeter
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
feedback; reaction; response
【医】 reaction; response