And he has one of those electronic key cards. 而且他有一张电子钥匙卡
are so closely interconnected, that the loss of one key species 以至于哪怕一种关键物种灭亡
..seeking the shelter of this bay at a key time in their lives. 在生命中的关键节点前来寻求这片海湾的庇护
is the key to beating human beings on their home turf. 才能在人类的地盘占上风
They are the key scavengers in this lake. 它们是湖里不可或缺的“清洁工”