一 + 面 + 镜子
镜子 means "mirror" and refers to a reflective surface used for seeing one's reflection. The suffix 子 is a common noun suffix in Chinese that often indicates a physical object. 镜子 is used with measure words like 面, as in 一面镜子 (a mirror).
她每天早上都要照镜子。
tā měitiān zǎoshang dōu yào zhào jìngzi.
She looks in the mirror every morning.
洗手间里有一面很大的镜子。
xǐshǒujiān lǐ yǒu yī miàn hěn dà de jìngzi.
There is a very large mirror in the bathroom.
镜子碎了,我得买一面新的。
jìngzi suìle, wǒ děi mǎi yī miàn xīn de.
The mirror broke, and I need to buy a new one.