Regaining the strength in your quadriceps muscles can be difficult, because your knee may hurt quite a bit in the first few weeks after your injury.是什么意思_Regaining the strength in your quadriceps muscles can be difficult, because your knee may hurt quite a bit in the first few weeks after your injury.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句