如果你想去二龙山，你可以有两种选择。

If you want to go to Erlong Mountain, you can have two choices.

本文阐述了二龙山水库及河流水质污染现状调查和水质评价结果。

In this paper, the present conditions of water pollution in Double-Dragon Reservoirand its contributories have been studied based on the investigation and water quality appraisal is given.