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卫生球 wèishēngqiú
gen. naphthalene; naphthalin; naphthaline
dril. mothball
tech. moth ball; naphthalene ball
卫生球俗名 wèishēngqiú
tech. naphthalene
卫 生 球: 6 phrases in 5 subjects
Earth sciences1
Electronics2
Space1
Technology1
United Nations1