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• it is difficult to do成分

• itisdifficulttodosth

• it is adj for sb to do成分

• it is difficult to doing

• be difficult to do 中to do 成分

• it diffcult to do

• it's difficult to do

• itisdifficulttogetused

• it is difficult for sb to do

• itisdifficulttoimagine

• it difficult用法

• be difficult to do中to do作什么成分

• itisdifficultforsbtodosth

• it is difficult for sb to do成分

• it is difficult to do something

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