☆ ADVANCED LEVEL : 3 ☆☆ INTERMEDIATE LEVEL : 1 ☆☆☆ ELEMENTARY LEVEL : 0 NONE : 42 ALL : 46

• 석유 (石油) : 땅속에서 천연으로 나며 태워서 에너지를 만드는, 주로 자동차나 공장의 연료로 쓰는 검은색의 기름. ☆☆ Noun
🌏 OIL; PETROLEUM: Black oil that sprouts naturally from the ground and is used to make energy by burning; it is usually used as fuel of cars or factories.

• Using transportation (124) • Weather and season (101) • Social issues (67) • Hobbies (48) • Law (42) • Using public institutions (library, post office, etc.) (8) • Architecture (43) • Making a promise (4) • Inviting and visiting (28) • Introducing (introducing oneself) (52) • Social system (81) • Marriage and love (28) • Ordering food (132) • Using public institutions (immigration office) (2) • Watching a movie (105) • Dating and getting married (19) • Exchanging personal information (46) • Cultural differences (47) • Using public institutions (post office) (8) • Describing clothes (110) • Describing food (78) • Residential area (159) • Pop culture (82) • Expressing day of the week (13) • Appearance (121) • Using the hospital (204) • Talking about one's mistakes (28) • Apologizing (7) • Housework (48) • Expressing time (82)