Rice is the main food for us.

大米是我们的主要食物。

Fish and brown rice are the main food.

鱼和糙米为主要食物。

These fish provide the main food for whales.

这些鱼为鲸鱼提供了主食。

Wheat is one of the main food crops in China.

小麦是我国主要的粮食作物之一。

It was the main food for herbivorous dinosaurs.

它就是食草性恐龙的主要食物。