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1·He could not but recall how feebly, and with what frequent pauses for breath, he had toiled over the same ground, only two days before.

他不禁忆起仅仅在两天之前，在他一路辛辛苦苦地沿着这同样的途径走来时，他是多么地周身无力，气喘吁吁，走不上两步就要停下来喘上一口气。

2·It seemed to him that the mysterious words of these men, so strangely hidden behind that wall, and crouching in the snow, could not but bear some relation to Jondrette's abominable projects.

他感到这两个人鬼鬼祟祟地躲在墙背后，蹲在雪里，说了那些半明不白的话，这也许和容德雷特的阴谋诡计不是没有关系的。

3·Elizabeth could not but smile at such a conclusion of such a beginning; but Mrs. Bennet, who had persuaded herself that her husband regarded the affair as she wished, was excessively disappointed.

伊丽莎白听到了那样的开头和这样的结论，不得不笑了一笑；不过，这可苦了班纳特太太，她本以为丈夫一定会照着她的意思来对待这件事的，哪里料到反而叫她大失所望。

4·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。《柯林斯英汉双解大词典》

5·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。《牛津词典》

6·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。

7·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。

8·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。《牛津词典》

9·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。《牛津词典》

10·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。《牛津词典》

不得不

1·Sam's audience hanging on his words with open mouth, he could not but proceed.

听众正张着嘴等他往下说，于是山姆不得不继续发挥下去。