It is questionable if all the mechanical inventions yet made have lightened the day's toil of any human being.

It is questionable if all the mechanical inventions yet made have lightened the day's toil of any human being.

值得怀疑的是，是否所有的机械发明都减轻了人们一天的劳动。

-- John Stuart Mill 约翰·斯图尔特·密尔