【机】 adjacent double bonds
each other; mutually; appearance; looks; look at and appraise; photograph
posture
【化】 phase
【医】 phase
adjacent; near; neighbour
【化】 ortho-
【医】 o-; ortho-
both; double; even; twin; two; twofold
【化】 dyad
【医】 amb-; ambi-; ambo-; bi-; bis-; di-; diplo-; par
catenary; chain
【医】 chain