Experts say even a two percent drop in the body's water supply can cause signs of dehydration.

VOA: special.2010.07.27

Because it's a gel electricity is going to move through the gel because there are ions in it the same way - for the same reason you don't drop an electrical device into the bathtub because charge moves through water that has ions in it.

由于凝胶中存在离子,电流会通过凝胶,同样--,因为同样的原因你不会把电器扔进浴缸里,因为水里也有离子,所以水可以导电

耶鲁公开课 - 生物医学工程探索课程节选

The Forest Service had a plane that it wanted to use to drop water bombs onto wildfires.

VOA: special.2009.11.24

Suddenly,I realized I had not looked at the drop of water for several days.

VOA: special.2009.07.25

Carefully,I moved the lens of my microscope closer to the drop of water.

VOA: special.2009.07.25

The drop of water had disappeared.

VOA: special.2009.07.25

He says ground troops need to secure drop zones for the heavy pallets of water, food and medicine, and that they need vehicles and other capabilities to secure and distribute the aid.

VOA: standard.2010.01.19

Family members rush to take advantage of every precious drop before the afternoon, filling plastic jugs,oil drums, and pails with water for use by the 15 people who live in this home.

VOA: standard.2009.08.01