原动力
motive force; prime mover; first cause; agent
远东山雀
(bird species of China) Japanese tit (Parus minor)
远东树莺
(bird species of China) Manchurian bush warbler (Horornis borealis)
远东苇莺
(bird species of China) Manchurian reed warbler (Acrocephalus tangorum)
远东豹
Amur leopard (Panthera pardus orientalis)