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in one's element
gen.	在…活动范围之内; 內行; 擅长

in element: 47 phrases in 18 subjects

Agriculture	1
Air defense	2
Animal husbandry	1
Automatic control	1
Automobiles	1
Business	2
Desert science	1
Earth sciences	3
Ecology	2
Economy	1
Electronics	1
General	5
Metallurgy	2
Securities	1
Space	3
Technology	16
Telecommunications	3
United Nations	1