/fɔ:ˈmældɪhaɪd ||; fɔrˈmældəˌhaɪd/noun [U]:
1 (symbol CH₂O) a colourless gas with a strong smell 甲醛（无色气体，有浓烈气味）
2 (also formalin /ˈfɔ:məlɪn ||; ˈfɔrməlɪn/) a liquid made by mixing formaldehyde and water, used especially for keeping examples of animals, plants, etc (specimens)in a good condition for a long time so that they can be studied by experts or scientists 甲醛溶液（由甲醛和水混合而成，用于保存动植物标本）