Skeletal muscle loss occurs with age in all mammals and probably results from a cumulative failure to repair damage caused by normal use 骨骼肌随年龄增加而衰退的现象，在所有的哺乳类动物身上都会发生，可能是肌肉正常使用时的损伤没有修复，日积月累的结果。
The marine mammal apparently noticed children doing laps recently around a course they had set up at the marin country day school next to the shores of the san francisco bay 这只海洋哺乳类动物日前显然注意到，马林郡日间学校的学童在紧邻旧金山湾所设置的跑道上绕圈行走。
It took two and a half billion years , to evolve from the earliest cells to multi - cell animals , and another billion years to evolve through fish and reptiles , to mammals 从最初始的细胞到多细胞动物的进化经历了25亿年，而从鱼类和爬行动物到哺乳类动物的进化又经历了10亿年。
Hong kong s ecological habitats consist of a wide variety of communities which host a surprisingly diverse array of mammals , birds , amphibians , reptiles , fishes , invertebrates and plants 括哺乳类动物、雀鸟、两栖类动物、爬虫类、鱼类、无脊椎动物及植物，种类之多，令人叹为观止。
A few finless porpoises - - smaller , stouter mammals with blunt noses - - were moved into a reserve , along with one baiji . the porpoises survived , but the captive baiji died 少数江豚?小而结实，嗅觉迟钝的哺乳类动物?和一只白暨豚一起被转移到一个自然保护区。江豚幸存下来，囿于此地的白暨却不幸死去。
We collect and re - organize the eco - log books of our rangers into a form of daily , so as to describe the habits and characteristics of various animals , plants , inserts , and birds 内文介绍详尽有趣，中英对照，透过一种自然日记的形式介绍本港的自然生态。内容包罗万有：植物鸟类蝴蝶真菌昆虫哺乳类动物海。
No elicits many other actions in mammalian systems including inhibition of cell growth , antibacterial effects , other anti - infectious effects , and also promotes learning and memory as well as smell and taste 一氧化氮在哺乳类动物系统中产生多种其他作用，包括抑制细胞生长抗菌抗炎，和改善学习记忆嗅觉和味觉等。
