But, when new challenges arrive, they can struggle to cope. 但当新挑战来袭 它们只能尽力去应对
presents challenges for the animals living there. 岛上的动物也要面临挑战
reflect the challenges faced by all life on Earth. 正如地球上所有生命都要面临的挑战
But these forests hold fewer challenges for the more mobile. 不过这些森林对于更灵活的动物来说 却没有什么挑战性