so these species must have been isolated for a very long time. 所以这些物种必定 与世隔绝了相当长的一段时间
they are most vulnerable at the scheduled time of departure. 它们在出发阶段最容易遭受攻击
For these fish the caves are a night time retreat, 对于这些鱼来说 洞穴是理想的过夜场所
but over time the process can produce some spectacular results. 但随着时间的推移 它们变成了最引人入胜的景观
At this time of the year bears should be fattening up for the winter. 在每年的这个时候 熊必须为越冬储备脂肪
For all monkeys morning is grooming time, 对于所有猴子来说 早晨正是“梳妆打扮”的时候
That leaves the male six-plumed bird of paradise with time to concentrate on other matters 这也使得雄六羽极乐鸟 有时间去关心其它的事