I was unable to attend because of a previous engagement.
我因有约在先，无法出席。
They were unable to prove that the unfortunate lady had died as a direct result of his injection.
他们不能证明那名不幸女士的死亡是由于他的注射直接造成的。
In 1890 he proposed that evolution was irreversible: that 'an organism is unable to return, even partially, to a previous stage already realised in the ranks of its ancestors'.
1890年，他提出进化是不可逆转的：“一个有机体无法回到其祖先先前到达的阶段，即使是部分逆转，也不可能。”
It was a difficult job as Helen was unable to see, hear or speak because of illness.
这是一项很困难的工作，因为海伦身患疾病，不能看、听和说话。
A person who is unable to stimulate others' curiosity or make their life enjoyable may appear somewhat boring.
一个不能激发别人好奇心的人或不能使生活变得愉快的人，可能会显得有些无聊。
A video shows him receiving physical therapy, but apparently unable to communicate and with little awareness of his surroundings.
一段视频显示，他正在接受物理治疗，但他显然无法跟人交流，而且对他身处的环境几乎没有意识。
A lot of attention is being given to children who leave school unable to read or write.
人们对那些离开学校却不能读或写的孩子给予了很多关注。
Sometimes parents get exhausted and frustrated and are unable to maintain a tolerant and composed style with their kids.
有时父母会感到疲惫和沮丧，不能对孩子保持宽容和冷静。
Unfortunately, Printwell has been unable to bring down the cost of manufacturing a printer.
不幸的是，Printwell一直无法降低打印机的生产成本。
One worry is that kids who spend a lot of time online at home are sometimes unable to socialise properly with other children when they are at school.
一个令人担忧的问题是，在家里花大量时间上网的孩子在上学的时候，有时无法与其他孩子进行适当的社交。
For example, early models of high-speed railroad cars loaded with sophisticated controls were unable to operate in a snowstorm because a fan sucked snow into the electrical system.
例如，装有复杂的控制装置的早期高速列车模型无法在暴风雪中运行，因为风扇会把雪吸进电力系统。
A young man sees a sunset and, unable to understand or to express the emotion that it rouses in him, concludes that it must be the gateway to a world that lies beyond.
一个年轻人看到日落，由于无法理解和表达日落在他心中唤起的激情，便得出结论：落日处想必是通往遥远世界的大门。
The police have been unable to serve a summons on him.
警方一直无法把传票送达他本人。
She will be unable to attend because of a prior engagement.
因事先有别的安排，她将不能出席。
He was unable to hold down a job after his breakdown.
他精神崩溃以后就没能保住工作。
He stood without moving a muscle, unable to believe what his eyes saw so plainly.
他一动也不动地站着，不敢相信自己的眼睛。
The plants were unable to withstand the rigours of a harsh winter.
这些植物经受不住严冬的考验。
Otherwise, it would be unable to grow from a seedling.
否则，它的幼苗将无法生长。
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