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.
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.
本文利用耦合波理论分析推导了单模平面光波导中两波混合的耦合波方程和弱相干光放大率的表示式。
The coupled equation of two-wave mixing and expressions for weak beam amplification in a single mode waveguide are deduced by application of coupled wave theory.
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