焕新门槛一降再降。这些数字背后，是一本更大的绿色账。一台新一级能效冰箱，比十年前的旧款每年省电约300度。按上海家庭平均用电量计算，三年省下的电费就够买一台新手机。全上海若百万台一级能效家电替代老旧高耗能设备，年均可节电数亿度，相当于减少数百万吨二氧化碳排放。
When you are using de bruijn indices, when you move a term t under a binder during some substitution operation, you need to bump any index that refers across the new binder, but not bump any index that refers inside the t. http://adam.chlipala.net/cpdt/html/DeBruijn.html
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