Today people use modern machines to look at the sky.

今天，人们用现代机器看天空。

There weren't any modern machines at that time.

那时没有任何现代化的机器。

In a warehouse, modern machines spin wool into yarn.

在一个仓库中，现代的机器将羊毛卷成纱。

That newly built plant is equipped with modern machines.

那家新建的工厂装备着现代化机器。

It was very difficult to build such a great wall without our modern machines.

没有现代的机械，要建这样一座长城是非常困难的。

It was very difficult to build such a wall in the ancient days without any modern machines.

没有任何现代机器，要修筑这样一座长城是非常困难的。

It was very difficult to build and rebuild such a great wall over wild and distant country without any modern machines .

没有任何现代机器， 在那荒无人烟， 遥远偏僻的土地上修筑和重修这样一座长城是非常困难的。