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whiten ['waɪtn] v
gen.	美白; 弄〔变，使，涂，刷，漂〕白; 加白; 白噪声化
archit.	弄白
dermat.	使白
met.	变白; 镀锡
tech.	漂白; 刷白

whiten: 2 phrases in 2 subjects

Air defense	1
Mathematics	1