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痕量元素 hénliàng yuánsù
agric. trace element
chem. trace element heng
el. tracer element
oil guest element
tech. accessory element; microelement; vestigial element
痕 〔微〕量元素
environ. trace element
痕〔微〕量元素
gen. minor element
量元素
met. minor element
痕量元素: 10 phrases in 7 subjects
Agriculture1
Desert science1
Earth sciences1
Ecology1
Genetics1
Oil / petroleum2
Technology3