It's her cub, 是幼崽

330. She's no longer limping, but she's now alone.
     她已不再跛足而行 却形单影只
331. Then, an hour after the female has left,
     雌雪豹离开后一个小时
332. the camera is triggered again.
     摄像机再次启动
333. It's her cub,
     是幼崽
334. taking her first steps towards adulthood and independence.
     开始了迈向成年和独立的第一步
335. She is unlikely to see her mother again.
     幼崽大概很少有机会与母亲重逢了
336. But every now and then,
     但不时地

来自《行星地球 第二季 第二集 Planet Earth S02E02 山脉》第 333 行