Witnesses said that two people were killed, but those accounts could not be confirmed.
目击者说两人遇害，但那些说法都没法得到证实。
I'm sure there's another point we could meet at, but not there.
我确信我们还有别的地点可以会面，但不是那儿。
I could not distinguish her words, but she sounded agitated.
我听不清她说的话，但听得出她很紧张不安。
We could probably trust her with the information but it's just not worth the risk.
我们也许可以将这些资料托付给她，但实在不值得去担这样的风险。
She tried to accept her marriage as her lot in life but could not.
她试图认命接受这桩婚姻，但做不到。
It should have been an occasion for rejoicing, but she could not feel any real joy.
原本应该是高兴的时刻，她却丝毫未感到快乐。
I emptied out my pockets but could not find my keys.
我把口袋里的东西都掏了出来，仍然找不到我的钥匙。
Under the first law, a robot could not harm a dangerous gunman, but under the zeroth law, a robot could kill the gunman to save others.
根据第一定律，机器人不能伤害带来危险的枪手，但根据第零定律，机器人可以杀死枪手以拯救他人。
He try to climb the tree, but he could not.
他尽力去爬树，可是爬不上去。
He now wanted to pull his over—hasty head back again, but he could not.
现在，他想把他那草率过栅栏的脑袋缩回来，可是他太急了，做不到。
Mike was next to me in his space suit but he could not take over my role.
迈克穿着宇航服坐在我旁边，但他不能取代我的角色。
As they got to like me, they wanted to take me along, but I could not leave.
当他们开始喜欢我时，他们想带我一起去，但我不能离开。
Well, not only could they not understand each other, but they forgot their manners.
嗯，他们不仅彼此都不理解对方，而且还忘了礼貌。
Boats could carry heavy weights, but canals could not cross hilly terrain; turnpikes could cross the hills, but the roadbeds could not stand up under great weights.
船可以运载重物，但运河不能穿越丘陵地带；高速公路可以翻山越岭，但路基承受不了巨大的重量。
You could have, but it would not have increased the speed of the program.
你可以这样做，但这不会提高程序的速度。
A slow response to a message could hurt not only your reputation but also your livelihood.
回复信息太慢不仅会损害名声，还影响生计。
He fetched his map, and looked for the castle, but could not find it.
他把他的地图拿来，开始寻找城堡，但没有找到。
Meanwhile, the deadliest strains of the virus perished with their hosts as natural selection favored strains that could infect hosts but not kill them.
同时，由于自然选择更倾向于选择那些能够感染宿主但不致其死亡的病毒，这种致命病毒便随着宿主的死亡而消失。
The lion tried to scratch his back, but he could not reach where the spider bit.
这只狮子想挠背，但他够不着被蜘蛛咬的那个地方。
Opening the door, she found herself in the street, but she could not see the tower any more.
她打开门，走在街上，但她发现再也看不见塔了。
At the time, people were wild for travel and for experiencing new places; but not everyone could afford it.
当时，人们热衷于旅行和体验新地方；但并不是每个人都支付得起这些费用。
Tom could lift it, after an awkward fashion, but could not carry it conveniently.
汤姆勉强能把它提起来，但提着走很不方便。
A slow response to a message could hurt not only your reputation, but also your livelihood.
回应信息迟钝不仅会损害你的声誉，还会影响你的生计。
Joe tried to remember, but was not sure he could say.
乔努力想记起来，但他说不准。
Acts of kindness could not only help others, but also make ourselves happier.
善良的行为不仅能帮助别人，也能使自己更快乐。
But I could not help thinking about that silly poem.
但是我情不自禁地想起那首荒诞的诗。
He knew he was behaving unworthily, but he could not help it.
他知道他的行为是可耻的，但他却不由自主这样做。
The robber took a light and began looking for it, but he could not find it.
强盗拿了一盏灯，开始找，但是找不到。
I tried to jump up, but I could not stir a limb, then I yelled aloud in a frenzy of fright.
我试图跳起来，可是我四肢动弹不得，然后我在惊骇中大声喊叫起来。
Many Americans came to believe that scientific certainty could not only solve scientific problems, but also reform politics, government, and business.
许多美国人开始相信科学的确定性不仅能解决科学问题，而且能改革政治、政府和商业。
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