For the discharge of water!

排水用的嘛！

In this way, a higher degree of suction is obtained in order to increase the discharge of water through the overflow (2).

所有这些都为了提供更大的吸力，以便增加水通过溢流元件(2)内部的流量。

Article 86 An owner of immovables shall provide the necessary convenience to a neighboring obligee in the use or discharge of water.

第八十六条不动产权利人应当为相邻权利人用水、排水提供必要的便利。

It might have been supposed that the discharge of water was at this place, for the extremity of the lake was almost on a level with the edge of the plateau.

湖水也许就是从这里流出去拘，因为湖岸几乎和高地的边缘一样高。然而还是找不到任何排水的痕迹。

As long as the water is clear enough not to absorb the rays, exposing it to a discharge lamp will destroy the DNA of viruses, bacteria and protozoa that could otherwise cause illness when swallowed.

只要水足够清澈不吸收光线，放到放电管下就会破坏水中能引起疾病的病毒、细菌和原生动物的DNA。