He nipped in with a smart question.
他突然插话，提出一个机智的问题。
There's no question that going to college is a smart economic choice.
毫无疑问，上大学是一个明智的经济选择。
No question, one can use a smart phone as an aid to memory, and I do use one myself for that purpose.
毫无疑问，人们可以用一台智能手机充当他们记忆力不够时的后备，而为了这个目的，我自己也确实有在用。
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