The problem was not solved completely until the invention of the marine chronometer in the eighteenth century.

这个问题直到十八世纪发明了航海经线仪才得以解决。

youdao

The problem was not solved completely until the invention of the marine chronometer in the eighteenth century.

这个问题直到十八世纪发明了航海经线仪才得以解决。

youdao