most will hold a little water in one form or another. 但大多数都会以各种形式储存少量的水分
They close up their leathery leaves to form an insulating blanket 它们合起革质叶片形成一道保温层
They invade the upper branches, where they climb out of their external skeletons and assume their adult winged form. 占据上端的树枝后 若虫开始进行转变到蝉的蜕皮动作
Individuals link together to form chains which can stretch for fifteen meters. 这些一个个单体组成的链条可长达15米
It's actually two thousand separate reefs that together form a barrier stretching for over a thousand miles along Australia's northeastern coast. 大堡礁由超过2000个独立的珊瑚礁组成 绵延在澳大利亚东北部海岸,长度超过1000公里
New couples quickly form a strong bond. 新的企鹅对很快就会建立深厚的感情
to form gigantic plagues several billions strong and as much as 40 miles wide. 从而形成巨大的灾害 无数“瘟神”组成的大军绵延长达40英里
the stream of bats form a doughnut-shaped ring. 即在空中组成一个面包圈一样的队列