好，如果导数很小的话，函数就基本没什么变化，可能我们就想把步子迈大一点儿了，但是别为这个担心？
All right. If the derivative is small, it's not changing, maybe want to take a larger step, but let's not worry about that all right?
当今世界，经济形势和工作环境都急剧变化，许多年纪稍大一点的人越来越担心受到淘汰。
A growing fear that many older people have in our rapidly changing economic and work environment is that of being viewed as obsolete before their time.
当今世界，经济形势和工作环境都急剧变化，许多年纪稍大一点的人越来越担心受到淘汰。
A growing fear that many older people have in our rapidly changing economic and work environment is that of being viewed as obsolete before their time.
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