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wind scale
gen.	風力階級 (ふうりょく・かいきゅう) River and Water Resources Glossary (Infrastructure Development Institute Japan)
tech.	風級 (ふうきゅう)
wind force scale
tech.	風力階級 (ふうりょく・かいきゅう)

wind scale : 6 phrases in 3 subjects

General	2
Physics	2
Technology	2