和宇宙中的其他三种力(电磁力、弱核力、强核力)相比，重力就微弱得多了，所以引力波很难被观测。

Compared with the other three forces in the universe (electromagnetism, the weak nuclear force and the strong nuclear force), gravity is relatively feeble, making gravitational waves hard to detect.

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本研究将“边缘层模型”应用于两层流体系统中弱非线性内波在台阶地形上的反射和透射问题的研究。

The edge-layer theory is applied to study the refection and transmission of the weakly nonlinear internal wave over a step in a two-layer fluid system.

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一些试验表明，符号位水平迭加方法强调反射波的相干程度，因而在剖面上突出了弱反射波。

Some experiments show that the sign bit horizontal stack method emphasizes the coherence of reflections, thus weak reflections on the section are enhanced.

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