meaning for 空洞 kōngdòng:

  • - cavity
  • - empty
  • - vacuous

suǒyǒu所有
de
gōngzuò工作
lúnwéi沦为
kōngdòng空洞
chúfēi除非
ài
qīngzhù倾注
qízhōng其中

And all work is empty save when there is love.