Wèile / bìmiǎn / chóng / chá / nóngmín / jīnnián / bǎ / yùmǐ / gǎizhòng / chéng / le / dàdòu.

为了避免重茬，农民今年把玉米改种成了大豆。

To avoid continuous cropping, the farmers planted soybeans instead of corn this year.