Fertilization is external, producing free-living planula larva.
体外
，能产生自由活动的浮浪幼虫。
, 胎行为[现
]过程, 孕过程;;液;
；试管内率Fertilization is external, producing free-living planula larva.
体外，能产生自由活动的浮浪幼虫。
Traditionally, doctors use gestational age, the number of weeks from fertilization to birth, to determine whether a preemie should receive invasive care.
传统上，医生们
孕龄，到出生的周数来决定极早产儿是否接进一步的关注。
A long-term field experiment was carried out to study the effect of fertilization on the organo-mineral complexation and the combined forms of humus of phaeozem in Jilin Province, China.
摘要
期定位试验研究了施肥对黑土有机无机复合及腐殖质结合形态的影响。
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