【建】 transesterification
ester
【化】 ester
【医】 compound ether; ester; lactam; lactan
base; basic; foundation; key; primary; radix
【化】 group; radical
【医】 base; basement; group; radical
exchange; interchange; change for; commute; permutation; reciprocation
replacement
【计】 exchange; swap; swapping; switching; transput; X
【医】 chiasmapy; cross-over; crossing-over
【经】 interchange; swap
affect; effect; intention; action; motive; operation
【医】 action; effect; process; role
【经】 role