但是当巧匠们接手之后，蒸汽机的效率一下子变成了四倍。

But when the tweakers took over the efficiency of the steam engine swiftly quadrupled.

youdao

但是当巧匠们接手之后，蒸汽机的效率一下子变成了四倍。

But when the tweakers took over the efficiency of the steam engine swiftly quadrupled.

youdao