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双重配种
agric. double mating; double service
双重配种通常指母畜在一个发情期内连续与两头公畜交配
anim.husb. double mating; double service; double cover
双重配种母畜在同一发情期内连续与两头以上的公畜交配
repr.biol. double cover; double mating; double service