Britain has the largest and most flourishing fox population in Europe.
英国拥有欧洲最大也是最具繁殖能力的狐狸种群。
Genes are those tiny bits of biological information swapped in sexual reproduction.
基因是在有性繁殖中交换的微小生物信息。
Bacteria reproduce by dividing and making copies of themselves.
细菌通过分裂和自我复制来繁殖。
The whole population is so inbred that no genetic differences remain.
整个族群都是同系繁殖，以至于根本不存在基因差异。
The first organisms that reproduced sexually were free-floating plankton.
最早开始有性繁殖的生物是四处漂浮的浮游生物。
During the breeding season the birds come ashore.
在繁殖季节各种鸟都飞到岸边。
Many fungi can reproduce asexually.
许多真菌可以无性繁殖。
The biology class studied the generation of fruit flies.
生物班的学生研究了果蝇的繁殖.
When animals have more food, they generally multiply faster.
动物在有较多的食物时, 一般繁殖得较快.
New bushes can be reproduced from roots taken from the parent plant.
灌木可以由母本取下的根来繁殖.
Lionesses bearing cubs in the zoo is nothing new now.
狮子在动物园繁殖早已屡见不鲜了.
Mice are prolific breeders.
鼠类繁殖力很强.
Most plants propagate by seeds.
大多数植物都是通过种子繁殖的.
Bacterial reproduction is accelerated in weightless space.
在失重的空间,细菌繁殖加快了.
Hot weather multiplied the bacteria in milk rapidly.
炎热的天气使牛奶中的细菌迅速繁殖.