【电】 four-frequency diplex
four
【医】 quadri-; Quat; quattuor; tetra-
frequency; frequently
both; double; even; twin; two; twofold
【化】 dyad
【医】 amb-; ambi-; ambo-; bi-; bis-; di-; diplo-; par
believe; faith; fuse; letter; message; sign; true; trust; without plan