老士 (Lǎo shì)
Teacher
规则 (Guīzé)
Rules
举手 (Jǔ shǒu)
Raise hand
听 (Tīng)
Listen
上课 (Shàngkè)
Class
打开 (Dǎkāi)
Open/Turn on
照相机 (Zhàoxiàngjī)
Camera
耳朵 (Ěrduǒ)
Ear