There has been a tendency for workers in different disciplines to define a plant as mature or juvenile.
各个学派的工作者明确划分一株植物是在成熟龄还是在幼龄。The recent discovery of an eel larva many times the size of the common one may furnish a basis for stories of sea serpents.
最近“一条幼龄鳗鱼其尺寸是普通鳗鱼的很多倍”的发现，可能提供了“深海大毒蛇”故事的依据。The very young children, in contrast, represent the responses of immune systems that have no past history with H1N1.
与此相反的是，幼龄儿童没有与H1N1的既往接触史，故而免疫系统无法及时作出反应。It helps young plants stay on the right track of development and aids seedling morphogenesis, but too much UV-B light can be toxic.
它也将有助于幼龄植物保持正常的生长轨迹和幼苗形态建成，但是高强度的UV-B光照射是有害的。The young growing leaf is a strong sink for upwardly moving assimilate.
正在生长的幼龄叶是使同化物向上移动的一个很强有力的“库”。Over a wide range of doses, adolescent rats learned how to get cocaine more readily than adults and took more of the drug overall.
在多种不同剂量上，总的来说幼龄鼠比成年鼠更乐意学习如何获得可卡因，服食量也更多。Adolescent rats are also more susceptible to cocaine abuse than adult rats, and are more sensitive to lower doses.
幼龄鼠也比成年鼠更容易受可卡因滥用的影响，对较低剂量更敏感。The pilot results were as follows: Juvenile was on the healthy condition, and SOC content and soil respiration rate were upper.
初步得出：在处于健康状态的幼龄林阶段，土壤有机碳含量和土壤呼吸速率较高；Young forest management will be managed according to local conditions, with an emphasis on forest cultivation to improve forest quality.
因地制宜开展中幼龄林抚育、森林改造培育，提高森林质量。