Some cells are visible to the unaided eye

有些细胞是肉眼可见的

Yet the us has proved unable to achieve what it seeks unaided .

而事实同样证明，美国也无法独力成就其寻求的目标。

Emerging economies are sustaining the pace of growth , but cannot assume the role of global powerhouses unaided .

新兴经济体仍在保持增长步伐，但无法独力担当驱动全球经济增长的重任。

In mr putin , russia has , for the first time in years , a leader who can walk unaided down an aircraft 's steps .

比如说普京，他是俄罗斯几年来第一个不用在别人的搀扶下就可以走下飞机阶梯的领导人。

The rise of the brand was not all unaided .

该品牌的崛起并非完全凭借自身。