亮度

shè diàn liàng dù

射电亮度

radio brightness

liàng dù tiáo jié

亮度调节

luminance/brightness control

píng jūn liàng dù

平均亮度

average/mean brightness

bǎ chē tóu dēng liàng dù diào dào zuì dà xíng shǐ

把车头灯亮度调到最大行驶

drive with your brights on

xīng tǐ de liàng dù dà yuē fēn sān gè xīng děng

星体的亮度大约分三个星等。

The star varies in brightness by about three magnitudes.