如今这个比例是一比四，而且到2050年这个数字将逐步变为一比二。

Now it is four to one—and on course to be two to one by 2050.

youdao

如今这个比例是一比四，而且到2050年这个数字将逐步变为一比二。

Now it is four to one—and on course to be two to one by 2050.

youdao