• The use of thionyl chloride eliminates this problem .
• This problem is remedied by prescribing the appropriate vitamin supplements.
• To circumvent ( or obviate ) a difficulty , one has to ...
• This problem has been countered ( or rectified ) by the addition of ...
• The difficulty is easily solved by the use of ...
• To get around this difficulty , many plants have ...
• To overcome ( or deal with ) the difficulty , you have to ...