他骑自行车不能保持平衡.用英语怎么说？

他骑自行车不能保持平衡.

He can't maintain enough equilibrium to ride a bike.

he

pron. 他，它，一个人；n. 雄性动物；

例句
Logic had prevailed and he had abandoned the idea.
最终理智占了上风，他打消了那个念头。

maintain

vt. 保持，保养，坚持，固执己见；

例句
Few people nowadays are able to maintain friendships into adulthood.
如今很少有人能将友谊维持到成年。

enough

adv. 足够地，充足地，十分地；adj. 充足的，足够的；n. 充分，足够，满足；int. 够了；

例句
She was old enough to absent herself from the lunch table if she chose...
她长大了，可以自己做主不来吃午餐了。

equilibrium

n. 平衡，均势，平静；

例句
He had recovered his equilibrium and even his good humour, somehow.
不知怎的，他已经恢复了平静，连心情也变好了。

to

prep. 向，朝着，到，关于，属于；adv. 朝一个方向的，到某种状态，关闭；

例句
I suggest you leave it to an expert...
我建议你把它留给专家来解决。

ride

vt.& vi. 乘，骑，驾；n. （乘坐汽车等的）旅行，乘骑，（乘车或骑车的）短途旅程，供乘骑的游乐设施；vt. （骑马、自行车等）穿越，搭乘，飘浮；

例句
I don't ride my motorbike much anymore...
我不怎么骑我的摩托车了。

bike

n. 自行车，摩托车，电动自行车；vi. 骑自行车；na. “motorbicycle”的变体；

例句
He struggled to hold the bike down on the banked corners...
拐过斜弯时他竭力将自行车把稳。