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1 (wiktionary) 2 (vi.wikipedia) 3 (en.wikipedia) 4 (glosbe)

Core Words Familarize yourself with the 'core words'.
Compounds Expand your vocabulary by studying more complex words built by the 'core words'.
Wordsense Learn about the wordsenses of the english term.

ETYMOLOGY

KOREAN 3.0	Eng	Wordtype	Etym.	Gb	Vie
☆☆	ACTIVITY; MOVEMENT	Noun	活动	活动	hoạt động
☆	EXERCISE; PHYSICAL ACTIVITY	Noun	体育	体育	thể dục, thể dục thể thao
☆	ACTIVITY; PERFORMANCE; ACTIVE ROLE	Noun	活跃	活跃，活动，驰骋	sự hoạt động tích cực, sự hoạt động sôi động
☆	RADIOACTIVITY	Noun	放射能	放射性	lực phóng xạ