Meaning of guāng:
光
light; ray (CL:道[dao4])
Zhè fú huà yòngle hěn duō guāng lái biǎoxiàn zhǔtí.
这幅画用了很多光来表现主题。
This painting uses a lot of light to express its theme.
bright; shiny; used up; finished
Tàiyáng de guāng ràng rén gǎndào wēnnuǎn.
太阳的光让人感到温暖。
The sunlight feels warm.
Tā de qián yǐjīng yòng guāng le.
他的钱已经用光了。
His money is already used up.
only; merely
Tā guāng chīle yī gè píngguǒ.
他光吃了一个苹果。
He only ate one apple.
to leave (a part of the body) uncovered
Jíshǐ tiānqì hěn lěng, tā háishi guāngzhe jiǎo zǒu zài xuědì shàng.
即使天气很冷,他还是光着脚走在雪地上。
Even though it was very cold, he still walked with bare feet in the snow.