真正的想念是一种习惯，一种长期且不易改变的心理状态。
The real one is a custom, a psychological condition that not easy to be changed.
这就是为什么你在留心观察一些比如诚实、善良和智慧这样的不易改变的品质。
This is why you may be on the lookout for certain stable qualities like honesty, kindness and intelligence.
过去认为是气候系统中不易改变的特征，如今变化最大：冰川融化以及海平面上升。
The biggest changes have come in features that have been seen as some of the slowest movers in the climate system: the melting of glaciers and the resulting rise in global sea levels.
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