Two-factor authentication is a popular method being practiced for increased security.
双因素身份验证是增强安全性的流行方法。
2
For strict slice method the safety factor can be obtained by two equilibrium equations given the orientation or the point of force action between the slices.
对严格条分法，用二个平衡方程，并假设条间力的作用方向或条间力的作用点位置，就能求出安全系数。
3
Thus we gave a kind of new method for solving the greatest common factor of two-variable polynomials.