It is easy to change a light bulb, sure, but it is harder to change the bulb and its fixture.

换一个灯泡当然很容易，但是要更换灯泡和其固定装置就比较难了。

youdao

We'll have to change the bulb again.

我们又得换个灯泡了。

youdao

We will have to change the bulb; it's gone.

电灯泡爆了，我们需要换一个。

youdao

There is no need to change the light bulb.

FORBES: How Many Economists Does It Take To Change A Light Bulb?

Partly because of their longevity -- no one wants to change a light bulb on the Moon -- but also their hardiness.

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The darkness will cause the light bulb to change by itself.

FORBES: How Many Economists Does It Take To Change A Light Bulb?