until they are big enough to join the rest of the herd. 直到它们长大到足以加入龙群
She'll protect them in the nest for many months, 它会在巢穴中保护它们达数月之久
she strays too close to the next. 它却又太靠近了另一个挑衅者
she must run the gauntlet of defensive mothers keen to protect their young. 它必须穿过一长排保护心极强的母龙
The long calm helped dinosaurs to proliferate in huge numbers. 长♥期♥的平静令恐龙数量激增
A period which allowed one group to become the mightiest of dynasties. 这个时期 令一个物种群建立了最强大的王朝
the planet has pushed life to the very edge of existence. 地球将生命推到了灭绝边缘