淡水的英文：
potable water
water with low salt content

参考例句：

There are bright prospects for freshwater fish farming
淡水养鱼大有可为。

a lake fed by a freshwater inflow.
一个流入淡水的湖

The sea water is heavier than the freshwater, so its pressure is greater, too
海水比淡水重，因此压力也来得大。

The hydrodynamic head is provided by influx of fresh water from the interior of tropical Jamaica.
水压头是由处于热带的牙买加内地流入的淡水提供的。

The salt water, being more dense, flows upstream under the fresh water which is flowing downstream
淡水在上层向下流动，比重更大的盐水在下层逆流向上。

He removed the small stopper from the calabash, and as the sweet water gurgled into it.
他扳开葫芦上的小盖，让淡水汩汩地流进葫芦。

Any of various Old World freshwater fishes of the genus Barbus or Puntius and related genera.
一种东半球鲃属或须鲃属及有关科属的淡水鱼类。

Their need was fresh water.
他们所必需的是淡水。

There is no sweet water in this island.
这个岛上没有淡水。

The patient needs some sweet water.
病人需要一些淡水。

potable是什么意思：
adj. 适合饮用的
n. 饮料

This type of silicone is safe for potable water.
所用的硅胶是饮用水安全型硅胶。

Suitable for Water (Potable) Heating and Space Heating
可用于饮料水加热系统或建筑物供热系统

These products are plain natural green health potables.
这些产品属纯天然绿色健康饮品。

water是什么意思：
n. 水；雨水；海水；海域
v. 给…浇水；供以水；加水；流泪；流口水

In smooth water
进入顺境

Is the water on or off?
自来水龙头开着还是关着？

Water Skiing is a surface water sport.
滑水是一项水面运动。

low是什么意思：
adj. 低的；在底部的；不足的；低于通常标准的；沮丧的；差的；状态不佳的
adv. 向下；在靠近…底部的位置；低于通常的水平；低声地
n. 低水平；低谷；低气压区
v. （牛）哞哞叫

low-velocity drop
低速度空投

To speak with a low, hoarse voice.
低哑地说用低而嘶哑的声音说话

To rate too low;underestimate.
低估对…估价太低；低估