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oligoelementos n
environ.	trace elements
met.	accompanying element
oligoelemento n
agric.	micro element; micro-element; micronutrient; minor element
chem.	micro-nutrient
econ.	trace element
food.ind.	micromineral; oligo-element; trace mineral
med.	oligoelement
met.	tramp element

oligoelementos: 2 phrases in 2 subjects

Medical	1
Patents	1