A rutabaga is a large, round vegetable that grows under the ground. The inside is usually yellow, and the taste is a little sweet, denser than a small white turnip. People mash it, roast it, or put it in winter soup. Though actually, the tidy picture — “a kind of turnip” — is a bit loose: it is its own plant, bigger and yellower than the turnips most learners first meet. In the United States and Canada the everyday name is rutabaga. In Britain and Ireland the same vegetable is almost always called a swede (from “Swedish turnip”). You will not see it on every stall in Taiwan; it is a cold-country crop. Shop signs in English-speaking countries often mix the two names, but they are pointing at one food.

蕪菁甘藍（英國人多叫 swede；不是台灣的大頭菜）