Rooted in the physical principle of leastaction, they have wide applications in diverse fields.
在于最小行动的物理原理，他们在完全不同的领域有广泛应用。
2
The existence and multiplicity results are obtained for a class of fourth-order nonlinear elliptic equations by the leastaction principle and the minimax methods, respectively.
通过极小化作用原理和极小极大方法得到了一类四阶非线性椭圆方程解的存在性和多重性。
3
At least four high-flying warplanes had to take evasive action.