She wore a pale yellow dress. It was old,but very clean.

VOA: special.2010.06.12

When making yogurt, it is very important to have clean equipment, clean hands and good temperature control.

VOA: special.2009.01.19

The air is clean. The trees are dark and very large.

VOA: special.2009.11.16

"The sea grass is very important." "It filters the water, it keeps the water clean.

VOA: standard.2010.07.05

"China has reduced extreme poverty through economic growth, but until very recently has overlooked the growing inequalities in health and health determinants like access to clean air,water, and sanitation."

VOA: standard.2010.04.07