红毛猩猩在树冠间用长臂灵活地荡来荡去。

___Orang-utans swing between tree branches using their long arms.

红毛猩猩因其聪明才智和与人类相似的行为而备受科学家关注。

Scientists are fascinated by ___orang-utans for their intelligence and human-like behaviors.