Tension is a mutual pulling force. It can be divided into internal tension and externaltension.
张力是一种相互牵引力，它可以分为内部张力和外部张力。
2
The thinking tension of perverseness is the dialectical unity of inner feature and external expression.
悖论思维张力就是这种内在品质和外在表现的辩证统一。
3
A nonlinear slowly varying amplitude equation, which incorporates cubic nonlinear term, external excitation and the influence of surface tension, was derived from potential flow equation.