直到其中一个发现狼，绵羊都没有想要绵羊。到那时，通常为时已晚。
(None of the sheep ever wanted a sheepdog around until one of them spotted a wolf. By then, it was often too late.)
直到其中一个发现狼，绵羊都没有想要绵羊。到那时，通常为时已晚。
(None of the sheep ever wanted a sheepdog around until one of them spotted a wolf. By then, it was often too late.)
