It would be unthinkable to ask him to do that.
做那件事是毫无可
的。
考虑的, 
受的, 可想像的, 难以置信的可的可思议的;想象的;
的;可的;到的;可信的;可避免的, 必然发生的;It would be unthinkable to ask him to do that.
做那件事是毫无可的。
Defeat is unthinkable.
战败是
可的。
It is quite unthinkable that a child like him can speak a foreign language so fluently.
像这样的孩子居然流利地说一种外语, 真是令人难以置信。
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