论述农村代课教师问题，从中挖掘教育实践中的不足，特别是农村基础教育。
Discusses the issue of substitute teachers, from lack of mining development in education, particularly in rural basic education.
其他替代方案在理论上很有吸引力，但在实践中要么不切实际，要么只能提供微不足道的改进。
The other alternatives are attractive in theory but in practice are either impractical or offer only marginal improvements.
如果你和我一样，从实践中得知你的记忆在睡眠不足的情况下无法好好工作。
If you are like me, you know from practical experience that your memory doesn't tend to function as well when you are sleep-deprived.
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