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/'әupәn/

柯林斯星级

牛津核心词汇

BNC频率: 403

现代语料频率: 355

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n. 公开, 户外, 空旷

a. 开着的, 开放的, 开阔的, 营业着的, 公开的, 悬而未决的

vt. 打开, 公开, 开放

vi. 展开, 开始, 展现

[计] 打开指令; 打开语句

n a pungent colorless unsaturated liquid aldehyde made from propene

developing or opening in succession from base to apex

a white crystalline amide of propenoic acid can damage the nervous system and is carcinogenic in laboratory animals

n a salt or ester of propenoic acid

-s form of acrylate n a salt or ester of propenoic acid

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