In high summer, the bulls are fat from the rich grazing 在盛夏 公野牛个个吃得胖乎乎的

143. The growing season is long,
     这里的草儿生长期很长
144. and the grass here can support herds all year round.
     能够全年维系所有的动物群落的食物需要
145. Male bison weigh in at one ton.
     公野牛重达一吨
146. In high summer, the bulls are fat from the rich grazing
     在盛夏 公野牛个个吃得胖乎乎的
147. and in prime condition, but only a few will mate.
     精神焕发.然而只有为数不多的公牛会和母牛交配
148. Exactly which few is about to be decided.
     到底哪些可以交配很快就要决定了
149. 0n temperate plains around the world, summer is a time for growth and reproduction.
     在世界各个温带地区的草原上 夏季都是生长繁殖期

来自《行星地球 第一季 第七集 Planet Earth S01E07 伟大草原》第 146 行