1. Educational institutions of higher learning and research institutes in China also take an active part in training and research in population and birth control.  
   中国高等学校、研究机构积极参加了人口与计划生育的培训和研究。
2. Mice with a highly active version weighed about 20 per cent less than normal mice at birth, and 35 per cent less at the age of one. 
   体内这一物质活跃的老鼠在出生时体重就比普通老鼠轻约20%，到一岁时则要轻35%左右。
3. Any of various mammals of the family Leporidae, especially of the genus Lepus, similar to rabbits but having longer ears and legs and giving birth to active, furred young. 
   野兔属于兔科尤其是兔属的各种哺乳动物，该属的兔类与野兔相似但有更长的耳朵和腿，并且新幼兔有活动能力且长毛
4. laceration of birth canal 
   软产道损伤
5. The Birth of Isaac 
   百岁得子

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