二氧化碳
tired and asleep college student for exam in classroom

老師教書太悶？為何上課總是睏？

可能唔係老師嘅錯，亦唔係學生嘅錯～

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tired and asleep college student for exam in classroom

老師教書太悶？為何上課總是睏？

可能唔係老師嘅錯，亦唔係學生嘅錯～ ...

123
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