单词拼写！We must take enough()to keep healthy.(锻炼)

exercise(不用复数）

exercise[C] 是锻炼（不可数）
exercises[U] 加复数就变成（做）操的操意思了

例如：做更多锻炼do more exercise
眼保健操eyes exercises

exercise
take exercise 做运动 在此excise做不可数名词

应该是exercises enough后要用复数