Ovulation rate is the principle factor limiting litter size in gilts and increasing the level of feed intake prior to mating will significantly increase ovulation rate.
排卵率是限制母猪窝重的主要因子，在配种前提高采食量能显著性地增加排卵效率。
The tapered plug or "needle" is screwed in or out of a mating orifice in the body and thus controls the effective orifice size.
其锥形插头或“针头”是阀体上配置的螺纹旋进旋出的节流道，因此能够有效控制节流面积。
To make the part interchangeable, each individual part must be made to a size that will fit the mating part in the correct way.
为了使零件能够互换，每个零件作出的大小必须能准确地适用于与其匹配的零件。
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