【机】 basic substituted
alkali; soda
【化】 alkali; base
base; basic; foundation; key; primary; radix
【化】 group; radical
【医】 base; basement; group; radical
replace; substitute; permute; supersede; supersession; substituent; superlant
【化】 permutation; substitution
【医】 substitution
end; finish; know clearly; oversee; settle; understand
