菾菜
甜菜 tián​cài
beetroot noun
the edible, typically deep red root of the garden beet plant, consumed as a vegetable

他在新鲜的沙拉里加了一些甜菜。

tā zài xīn​xiān de shā​lā lǐ jiā le yī​xiē tián​cài.

He added some beets to the fresh salad.

sugar beet noun
a variety of the Beta vulgaris plant cultivated for its high sucrose content and used as a major source of commercial sugar

农民在田野里种植甜菜，茂密的叶片在阳光下生机勃勃。

nóng​mín zài tián​yě lǐ zhòng​zhí tián​cài, mào​mì de yè​piàn zài yáng​guāng xià shēng​jī​bó​bó.

Farmers are growing sugar beets in the fields, their dense leaves looking vibrant under the sunlight.