Truffles are a kind of mushroom that grows underground.

块菌是生于地面的一种菌类植物。

youdao

The peanut is not really a nut, but a pea. It is a strange pea because it grows underground.

花生其实不是坚果，而是一种豆类。

youdao

It is a strange pea because it grows underground. But peanut plants also have green vines with yellow flowers. These vines or stems grow above the ground and are quite long.

它很奇特是因为它长在地底下，但是花生的植株上也有绿色的藤蔓和黄色的花，这些长长的藤蔓或茎长在地上。

youdao

The spice ginger comes from the part of the ginger plant that grows underground.

VOA: special.2009.05.19

Squat and knobby, the tubers aren't artichokes at all, but part of a species of sunflower that grows underground.

WSJ: Michael Anthony's Silken Sunchoke Soup | Slow Food Fast