释义：看见一片落叶，就知道一年内的时间将要到头了。通过细微的迹象，可以预料到整个形势的发展趋向与结果。
From this point on DO NOT WASTE ANOTHER DAY！！！ Make a promise to yourself that you’ll start today because everyday is an opportunity to begin a new way of life and everyday you waste you add to the misery you carry. Since we’re not promised tomorrow you either will die in your misery or you’ll die in gift， pick your gift.
我们开采的每一吨煤炭都承载着我们对可持续性的承诺。
在量子力学中，测量的行为可以改变被测量系统的状态。