时龄 meaning in English

chronological age

For slow replacement the age distribution function assumed is unimportant .
对缓慢置换，假设的时龄分布函数变得不重要。
The parasitized dbm larvae had prolonged their 4th instar duration obviously , and the later the larva had been parasitized , the longer this extended duration became
小菜蛾幼虫被寄生后，其4龄发育历期较未被寄生的显著长，且寄生时龄期越大4龄历期延长越多。
The foci located the basal in midgut not in control but also in test , the results showed that the addition of optical brighteners did n ' t change the spots of infection but improved the viral enhancement , in addition , infection of hemolymph cell showed that optical brightener increased sensitivity of larvae to virus , forming more foci
可见，对于处于不同时龄的供试幼虫接种病毒时，添加荧光增白剂均可提高病毒在中肠组织中的感染能力。从病毒在中肠中形成的病灶部位可以看出，实验组与对照组的病灶均靠近中肠的基底膜，荧光增白剂的加入并不能改变病毒在中肠组织的感染部位。