| 单词 | 安全火柴 |
| 释义 | 〔phosphorus〕Symbol P A highly reactive, poisonous, nonmetallic element occurring naturally in phosphates, especially apatite, and existing in three allotropic forms, white (or sometimes yellow), red, and black. An essential constituent of protoplasm, it is used in safety matches, pyrotechnics, incendiary shells, and fertilizers and to protect metal surfaces from corrosion. Atomic number 15; atomic weight 30.9738; melting point (white) 44.1°C; boiling point 280°C; specific gravity (white) 1.82; valence 3, 5. See table at element 符号 P 磷：一种易起化学反应的、有毒的非金属元素，常在磷酸盐中天然存在，尤其是磷灰石，以三种同素异形的形式存在，为白色（有时是黄色），红色和黑色，是原生质的基本成分，可用于安全火柴、烟花、燃烧弹和化肥，还可以保护金属表面免于腐蚀。原子序数为15；原子量30.9738；熔点（白色的）为44.1°C；沸点为280°C；比重（白色的）1.82；化合价3,5 参见 element〔matchbook〕A small cardboard folder containing safety matches and having a striking surface along the bottom.对摺式火柴纸板：装有安全火柴并且沿底部有可擦着表层的小薄纸板夹 |
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