英汉词典

1. 电灯泡
    A bulb is the glass part of an electric lamp, which gives out light when electricity passes through it.

    e.g. The stairwell was lit by a single bulb.
           楼梯间只有一盏灯照明。

2. 球茎；鳞茎
    A bulb is a root shaped like an onion that grows into a flower or plant.

    e.g. ...tulip bulbs.
           郁金香球茎