gōng zuò rén yuán dī shēng shuō mài kè fēng shì yī xià hòu pái tóng xué hái zài zhǎo zuò wèi

工作人员低声说“麦克风试一下”，后排同学还在找座位。

The staff member said in a low voice, 'Testing the microphone,' while students in the back were still looking for their seats.