如何使用 "unable" 造句

1. Why were regulators unable to better manage the system ?
为什么调控机构无法更好地管理这个体系?
2. And mr singh seems unable to bridge that gap .
而看来辛格无力消除分歧两派间的隔阂。
3. They were unable to explain why .
他们无法解释其中的原因。
4. They were unable to contradict her strong ideals .
他们无法对抗她强大的意志力。
5. I interrupted , unable to keep silent .
我无法再保持沉默,打断了他。