English ⇄ German Russian

opportunity knocks but once
idiom.	Die Gelegenheit kommt nur einmal (Andrey Truhachev)

opportunity: 317 phrases in 44 subjects

Accounting	7
Agriculture	5
Alternative dispute resolution	5
Astronautics	1
Biology	2
British usage, not spelling	3
Business	26
Commerce	2
Communications	2
Construction	5
Cultural studies	1
Economy	17
Education	24
Electronics	1
Employment	5
Environment	2
European Union	1
Finances	1
Fish farming pisciculture	9
Foreign trade	4
General	88
Human rights activism	2
Immigration and citizenship	1
Informal	2
Information technology	2
International Monetary Fund	3
Labor law	9
Law	14
Life sciences	2
Marketing	1
Microelectronics	1
Microsoft	11
Natural resourses and wildlife conservation	2
Non-governmental organizations	3
Obsolete / dated	2
Operations research	1
Patents	2
Politics	4
Polygraphy	2
Research and development	1
Social science	33
Sociology	2
Trade unions	1
Transport	5