difficult 后加doing还是加to do
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加to do ,It's difficult to do sth,做什么事很难.
比如：It's difficult to say.很难说.It's difficult to explain it away.要把这（凝点）解释掉是不容易的.
比如：It's difficult to say.很难说.It's difficult to explain it away.要把这（凝点）解释掉是不容易的.
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