water proof water resistance

What is the difference between "water-resistant," "water-repellent," and "water-proof" fabric? Water-Resistant fabrics shed water because of their weave or because they have been treated. They will soak through in a heavy rain, however. Water-Repellent fabrics are more effective than water-resistant fabrics. They are either very tightly woven or coated with a finish that causes the water to make little beads when it hits the fabric rather than going through. The finish may wear off over time or come off in drycleaning. Read the label to determine whether drycleaning is allowed. A silicone spray may rejuvenate the finish. Water-Proof fabrics can not be penetrated by water and should keep you dry, even in heavy rains. They may be extremely tightly woven, such as a fine polyester/nylon blend, rubber or plastic or other non-porous material, or coated with a finish that makes them breathable but closed to water. Be sure to read the care label before laundering.

water proof 是防水，通常内部镜身注氮,橡胶O环封口.可抗水压由一米至五米不等,镜身内部不会积聚水气或发霉.但若保养不佳最外镜面亦可发霉 water resistance是可防止水花溅入机身内,但不能抗水压

前者是防水的，一般用于衣服，鞋子，手表之类的生活用具。后者是用于专业上。例如水利工程中防水的用具一般用这个词。

防水