tā / men / de / yán / jiū / fāng / xiàng / wán / quán / bù / tóng / jiǎn / zhí / fēng / mǎ / niú / bù / xiāng / jí

他们的研究方向完全不同，简直风马牛不相及。

Their research directions are completely different and have virtually nothing to do with each other.