Until recently, scientists were unable to make full use of antibody power . 直到目前，科学家们还不能充分利用抗体的力量。
People discussed it with great earnestness and were unable to come to any definite conclusion . 人们非常认真地展开讨论，然而却莫衷一是。
The victim will suddenly be unable to speak and may clutch his throat in obvious distress . 患者会突然不能说话，抓住自己的喉部，有明显的呼吸困难。
However skilled he may be , he is unable to do his work well without a sense of responsibility . 技术熟练不一定能做好工作，还要有认真负责的工作态度。
Sir leicester, for all his scrupulous politeness, is unable to assist her, and is left behind . 累斯特爵士虽然殷勤周到，却来不及搀扶她，而被抛在后面。
Sounding rockets would be useless if they were unable to send information back to the earth . 高空探测火箭如果不能把资料送回地面，那就没有什么用处了。
His voice expressed the frustration he felt at being unable to put his feeling into words . 从他的口吃中可以听出，他是苦于无法用语言来表达自己的一片痴情。
His outward calm is in very vivid contrast to the restlessness of my character, which i am unable to conceal . 他的外表平静，正和我不能隐藏的内心不安构成很明显的对照。
Heart failure is said to occur when the heart is unable to pump blood at a rate sufficient to meet requirement of the tissues . 当心脏搏出血液的速度不能满足组织需要时，就发生心力衰竭。
