然而，后一个问题，生物学已经有了几种解释，它们都以长寿命与生殖能力的平衡为中心。
For the latter, though, biology has several explanations, all of which revolve around a trade-off between longevity and the ability to reproduce.
不列颠生殖协会(BFS)希望得到更多资源以满足潜在捐精者在工作时间后能够去那些关门较迟的诊所捐精。
The BFS wants more resources needed to run late-opening clinics to accommodate would-be donors after normal working hours.
玉米的单倍体育种，是利用花药培养或孤雌生殖产生单倍体后，进行人工或自然加倍，迅速获得稳定的新品种的育种方法。
The haploid breeding of maize is a technology that using anther culture or gynogenesis to produce haploid, and then obtain stable new varieties through natural or artificial doubling.
衣原体和支原体侵入人体泌尿生殖道后，都有1 ~3周或更长的潜伏期。
Chlamydia and Mycoplasma invasive human urogenital tract, there are 1 to 3 weeks or longer incubation period.
目的总结甲氨蝶呤(MTX)治疗输卵管妊娠后的生殖状态。
Objective To analyze the reproductive prognosis after treatment of tubal pregnancy with the systemic methotrexate (MTX).
目的探讨腹膜后淋巴结切除术在初治及复发卵巢恶性生殖细胞肿瘤（OGCT）患者中对肿瘤复发及患者生存的影响。
Objective To evaluate the impact of lymphadenectomy on the relapse and survival of malignant ovarian germ cell tumor(OGCT).
胚胎干细胞是来源于附植前胚胎的内细胞团或附植后胎儿的原始生殖细胞具有发育全能性的细胞。
Embryonic stem cell is a kind of undifferentiated pluripotent stem cell, which stems from pr Eimplantation ICM or early fetus primordial germ cell.
方文：这会导致真社会性动物中主管繁殖的“后”和“工作者”进化出不同长度的寿命和生殖功能。
This would allow for the evolution of divergent life lengths and reproductive value curves between workers and reproductives. Predators fitting this description would include snakes.
当生殖细胞进人花粉管后，在较短的时间内接近营养核，并与其相贴合。
After entering the pollen tube, the generative cell approached the vegetative nucleus before long and sticked each other.
在育苗盘中对番茄接种5种AM真菌菌种，比较不同菌种对移栽后番茄的营养生长和生殖生长的影响。
Tomato plants were inoculated with 5 AM fungi in seedling trays, in order to compare the influence of different AM fungi species on vegetative growth and reproduction after transplanting.
在育苗盘中对番茄接种5种AM真菌菌种，比较不同菌种对移栽后番茄的营养生长和生殖生长的影响。
Tomato plants were inoculated with 5 AM fungi in seedling trays, in order to compare the influence of different AM fungi species on vegetative growth and reproduction after transplanting.
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