unable to find a certificate 不能找到认证
Unable to provide a quotation 无法报价
Unable to get a scholarship 无法得到奖学金
unable to repay a kindness 无以为报
Unable to answer a customer 无法答复顾客
I was unable to attend because of a previous engagement.
我因有约在先,无法出席。
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。
Somalia's weak central government must deal with a deadly rebellion inside the country and is unable to police its waters.
VOA: special.2009.04.25
Why are we unable to talk to a crowd as we talk to a single friend?
为什么我们不能跟一群人讲话,却可以单独同朋友高谈阔论?
Or, for that matter, where a loved one of mine is unable to make the decision,
或者,在某种情形下,我的某个亲人无法做出这个决定,
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