elliptic pseudo-differential operator

例句：

1. 1. Theelliptic pseudo-differential operator is a crucial tool for solving complex partial differential equations.
   椭圆伪差分算子是解决复杂偏微分方程的关键工具。
2. 2. In the field of mathematical physics, the elliptic pseudo-differential operator plays an important role in modeling nonlinear phenomena.
   在数学物理领域，椭圆伪差分算子在模拟非线性现象中起着重要作用。
3. 3. The elliptic pseudo-differential operator is widely used in engineering and science to solve variousproblems related to fluid dynamics and heat transfer.
   椭圆伪差分算子在工程和科学中被广泛使用，用于解决与流体动力学和热传递相关的各种问题。