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单词 halogen
释义
halogen
(hælədʒən )
Word forms: halogens
variable noun [oft N n]
A halogen is one of a group of chemical elements that includes chlorine, fluorine, and iodine. Halogens are often used in lighting and heating devices.
...a halogen lamp.
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更新时间:2024/11/15 1:42:59