People change and forget to tell each other.
The coal industry must evolve to meet modern environmental standards, or it will become obsolete.
我不害怕失败。
I don't believe in guilty pleasures - if you enjoy something, enjoy it.
系统辨识是从观测到的输入输出数据中建立动态系统数学模型的科学与艺术。
未来的竞争，不是产品的竞争，而是服务的竞争。
选自汉·桓宽《盐铁论·力耕》。道：放大。治理百姓的方法，在于节约用度，注重农桑。
I not only came to understand that 'change' was a part of Josie, and that I should be prepared to adapt to it, but I also began to realize that this was not a trait unique to Josie; I came to understand that people often feel the need to present a carefully prepared version of themselves to the outside world - much like arranging a shop window - and once the moment has passed, there's no need to take it too much to heart.