[ U ] the soft grey or black powder that is left after a substance, especially tobacco, coal, or wood, has burned（尤指烟草、煤、木头燃烧后的）灰，灰烬

[ C ] a forest tree that has a smooth, grey bark (= outer covering), small greenish flowers, and seeds shaped like wings白蜡树；枔

[ U ] the wood from an ash tree白蜡木

abbreviation for Action on Smoking and Health: an organization in Australia, the UK, and the US that tries to stop the sale and use of tobacco products（澳大利亚、英国、美国的）禁烟与保健行动组织（Action on Smoking and Health的缩写）