doubt if
英 美
怀疑如果
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如果怀疑
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怀疑
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怀疑是否
... wonder if：不知道/想知道是否…… doubt if：怀疑是否…… let alone：更不用说 ...
I agree with it in principle but I doubt if it will happen in practice.
我原则上是同意它的，但我怀疑在实践中它是否会发生。
I have family and friends who have had swine flu, though I doubt if they appear in the figures.
我有家人和朋友感染了猪流感，尽管我怀疑他们是否出现在数据中。
I doubt if Kieth totally agreed to those yesses.
我怀疑基思是否完全同意那些看法。
