It was certainly useful to have her there to chauffeur him around.
有她在那儿为他开车肯定是有用的。
他们当然是有用的。
His charisma was certainly useful.
他的个人魅力的确是有用的。
The identification is certainly useful, but you do not need namespaces to achieve that.
这一证明当然很有用，但并不一定要用名称空间来获得。
But it is probably more useful and certainly less dangerous.
但是它可能更加有用也无疑危险程度更低。
But it is probably more useful and certainly less dangerous.
但是它可能更加有用也无疑危险程度更低。
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