But could you send back 但是你能不能 ; 但是你能不能送回
But Could Not Stop 但却难以停止
But Could Not 但不能
But Could Not Bear 只舍不得
But could never help 却无能为力
But Could Not Survive 但都没有成活
But everybody else could tell 但没有人能回答 ; 但所有人都知道 ; 但是每个人都告诉我 ; 但任何人都知道
I hate to trouble you, but could I use your phone?
我不愿麻烦你,但我能用一下你的电话吗?
Sorry to bother you, but could I speak to you for a moment?
不好意思打搅你,我能不能跟你说几句话?
He looked up at the buildings opposite, but could see no open window.
他抬头看了看对面那些楼,但看不见一扇开着的窗户。
Her teachers said the little girl knew all the rules but could not seem to follow them.
VOA: special.2009.07.31
Question: But could the patient have ? still been alive, nevertheless?
问题,但即使如此,这个病人当时可能还是活的,对吗?
So, it's more effective because it's a live virus but it's a little bit more concerning because it's a live virus as well, in that you trust that it's attenuated but could it convert back to a virulent form or a form that caused a disease.
因此,口服疫苗更加有效,因为它是活性病毒,但又是因为这一点,人们也存有更多顾虑,当它处于减毒状态时你会信任它,但是它会不会转变回,强毒壮态或者致病状态呢
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