The color, the wavelength, of light emitted changes as the bar heats up.

光的颜色、波长会随着棒加热而改变。

To rescue the Quagmires, the Baudelaire children climb back up the elevator shaft and heat up iron bars to melt the bars of the cage.

为了拯救夸米尔一家，波德莱尔一家爬上电梯井，加热铁条来融化笼子的铁条。

He needs a very hot fire to heat the iron bars which he makes into horse-shoes and many other things; and he could not have this without using bellows.

要制造马蹄铁或者其他诸多铁制产品, 需要极为炎热的火焰来加热铁条, 而风箱就必不可少。