This is known as the replacement level.
这就是人口更替水平。
The move to replacement-level fertility is one of the most dramatic social changes in history.
人口趋向生育等值替换水平是历史最有戏剧性的社会变化。
Remember: The Honor Level system is an extension of your classroom discipline system, not a replacement for it.
请牢记：荣誉等级制度是你的课堂纪律体系的延伸，并不能替代它。
Remember: The Honor Level system is an extension of your classroom discipline system, not a replacement for it.
请牢记：荣誉等级制度是你的课堂纪律体系的延伸，并不能替代它。
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