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。”
I feel as though I am trapped in a labyrinth in this mansion of ours, unable even to get out of this drawing-room to the telephone out on the landing.
我觉得自己好像被困在这公寓的迷宫里，甚至不能从这个客厅出去，到外面楼梯平台去接电话。
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。
The military may feel unable to hand over power to a civilian president next year.
军方可能觉得无法在明年把政权移交给一位民选总统。
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。
It would be unable to grow from a seedling.
它的幼苗将无法生长。
Otherwise, it would be unable to grow from a seedling.
否则，它的幼苗将无法生长。
People with disabilities who are unable to use a keyboard or mouse can shop without any help.
那些不能使用键盘或鼠标的残疾人可以在没有任何帮助的情况下购物。
Adults acted like he was unable to understand them, as if he was a baby.
大人们的表现显得好像他是一个婴儿一样，不能理解大人们。
I was unable to keep focused for more than an hour at a time.
我无法一次集中注意力超过一个小时。
In fact, most birds have a very poor sense of smell, so in most cases they are unable to even notice the smell of humans on baby birds.
事实上，大多数鸟类的嗅觉都很差，所以在大多数情况下，它们甚至不能注意到人类在幼鸟身上留下的气味。
Baudelaire regarded photography as "a very humble servant of art and science"; a medium largely unable to transcend "external reality".
波德莱尔认为摄影是“艺术和科学的一个非常卑微的仆人”；是一种很大程度上无法超越“外部现实”的媒介。
On the other hand, a comparatively warm body with a small surface gravity, like Earth's moon, is unable to hold even the heaviest gas and thus lacks an atmosphere.
另一方面，像地球的卫星这种相对温暖、表面引力较小的天体，它们连最重的气体也无法容纳，因此也没有大气层。
She arrived in a wheelchair, unable to walk from metastatic fractures, wearing a stylish bandanna.
她是坐着轮椅来的，她由于转移性骨折而不能行走，戴着时尚的头巾。
Yet, despite the obvious rewards of engaging in office politics—a better job, a raise, praise—many people are still unable—or unwilling—to "play the game".
然而，尽管参与办公室政治会带来明显的回报——更好的工作、加薪、表扬——但许多人仍然无法——或不愿——“玩这场游戏”。
Employers fear they will be unable to recruit students with the skills they need as the economic recovery kicks in, a new survey reveals.
一项新的调查显示，雇主们担心，随着经济复苏的到来，他们将无法招聘到具备所需技能的学生。
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