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major element

agric., chem. ★ 大量元素
earth.sc. ★ 主元素
genet. 必需元素
geogr. ★ 又称常量元素
met. 主要元素
tech. 常量元素
major-element
: 9 phrases in 5 subjects
Agriculture2
Ecology1
Oceanography & oceanology1
Public security1
Technology4

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