bulb

词源同ball, 膨胀，鼓起，球。

bulb

bulb: [16] Bulb can be traced back to Greek bólbos, which was a name for various plants with a rounded swelling underground stem. In its passage via Latin bulbus to English it was often applied specifically to the ‘onion’, and that was its original meaning in English. Its application to the light bulb, dating from the 1850s, is an extension of an earlier 19th-century sense ‘bulbshaped swelling in a glass tube’, used from the 1830s for thermometer bulbs.

bulb (n.)

1560s, "an onion," from Middle French bulbe (15c.), from Latin bulbus "bulb, bulbous root, onion," from Greek bolbos "plant with round swelling on underground stem." Expanded by 1800 to "swelling in a glass tube" (thermometer bulb, light bulb, etc.).

1. A 40 watt bulb would be quite sufficient and would not obtrude.

40瓦的灯泡完全够亮了，并且不会晃眼。

2. An efficient bulb may lighten the load of power stations.

一个节能灯泡也许就能减轻发电站的负荷。

3. This makes the total cost of the bulb and energy £27.

这使灯泡与电费合计为27英镑。

4. The naked bulb was directly over his head.

裸露的灯泡正好在他的头顶上方。

5. an unshaded light bulb

没有灯罩的电灯泡