gentle plant eaters that form herds many thousands strong. 温和的食植动物 数以千计 成群结队

171. This was the age of dinosaurs.
     那就是恐龙时代
172. The long calm helped dinosaurs to proliferate in huge numbers.
     长♥期♥的平静令恐龙数量激增
173. These are Maiasaura,
     这些是慈母龙
174. gentle plant eaters that form herds many thousands strong.
     温和的食植动物 数以千计 成群结队
175. This mass gathering provides safety,
     这种大规模聚集能够提供安全
176. and not just for the adults.
     不光是为成年个体
177. This rather cautious female
     这只小心的母龙

来自《我们星球上的生命 第一季 第一集 Life on Our Planet S01E01 生命法则》第 174 行