You may find that you can't concentr on the mrial for more than an hour (or a half hour).
可能你会发现自己无法专心阅读超过一小时（甚至半小时），这时你就需要一个计划。
2
This product enjoys the characteristics of low power dissipation, low cost. Meanwhile, it has the function of digital display of temperature, humidity and oxygen concentr…