bulb

/bəlb/

a modified bud consisting of a thickened globular underground stem serving as a reproductive structure

中文释义：球茎；电灯泡

Tulips grow from bulbs planted in autumn and bloom in spring.

郁金香从秋季种植的球茎中生长，春季开花。

We need to replace the burnt-out light bulb in the living room.

我们需要更换客厅里烧坏的电灯泡。