and the alpha male decides that it's time to leave. 雄性首领决定是时候离开了

275. Some of the chimps start to help themselves
     一些黑猩猩开始食用
276. to people's crops.
     人类的庄稼
277. They have outstayed their welcome,
     黑猩猩群不再受欢迎了
278. and the alpha male decides that it's time to leave.
     雄性首领决定是时候离开了
279. The chimps make this dangerous journey every day.
     每天 黑猩猩都要经历这样的危险旅行
280. But these highly intelligent animals,
     然而这些高度智慧的动物
281. our closest living relatives,
     也是人类最近的亲属

来自《行星地球 第三季 第五集 Planet Earth S03E05 森林》第 278 行