The rough waters in the trough scatter light in all directions, forming a dark line.
谷底汹涌的水体将光散射到各个方向，形成了一条暗线。
2
He invents the light bulb trough unimaginable failure.
通过我们无法想象的失败，爱迪生发明了电灯。
3
The movement of light oil(gasoline and kerosene)in subsurface homogeneous water saturated zone and water unsaturated zone were simulated in a two-dimensional sand trough model.