如果围绕某个函数的简单方向构造一个加密算法，那么想要破解加密的任何人都需要从相反的方向来解密。
If you build an encryption algorithm around a function's easy direction, anyone wanting to break your encryption needs to work at it from the hard side.
即使要构造一个纯信息性，或纯交互性站点，确定站点趋向哪个方向也很关键。
Even though you'll rarely build a site that is purely informational, or purely interactional, identifying your site as strongly leaning toward one or the other is key.
所谓重力异常线性构造信号就是重力异常水平总梯度沿重力方向的一阶导数且是大于零值的那一部分。
So-called gravity anomaly linear structure signal is derivative of gravity anomaly level total gradient on gravity direction, and the derivatives must be greater than zero.
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