every 30 minutes (매 30분 마다)의 영어 표현에 대한 보충 설명

[fatherofsusie]

every : 모든
        Every participant (단수) is responsible for the safety of his/her own luggage.
        Every participant is expected to maintain the highest moral conduct, in private and in public.
        every day / every hour / every minute (단수)
        every other day (단수) : 2일에 한번씩, 하루 건너서 하루
        twice a day (단수) : 하루에 2번
        every three days : 3일에 한번씩
        Every three days the space station circles the Earth.
        three times a day (단수) : 하루에 3회씩, 하루에 3번씩
        every 20 minutes : 매 20분마다 = at every 20 minute interval
        The shuttle bus runs every 20 minutes from 6:30 am to 9:30 pm. = The shuttle bus runs at every 20 minute interval
        Transportation by bus will be available between the hotel and the the convention center about every 20 minutes between 6:30-9:30 pm.
        every 30 minute presentation (단수) : 30분 단위의 발표
        Every 30 minute presentation will end with a 10 minute discussion.
        every 3 hour class (단수) : 매 3시간 마다의 수업
        We need 6 hours of homework after every 3 hour class.
        every two years : 2년마다 = once every two years, biennial (biannual : 매년 2회 = semi-annual, twice a year)
        tri-annual : 3년마다 = triannual
        tri-annual conference : 3년마다 개최하는 회의
        every four years : 4년마다 = once every four years
        The World Cup is held every four years for one month between June and July.
        The Olympic games were held in honor of Zeus every four years in the summer, between July and September depending on the year, under the leadership of the people of the nearby city of Elis.
        monthly conference : 매월 개최 회의
        half yearly conference : 6개월마다 개최하는 회의 = half-yearly conference = six-monthly conference
        bi-annual conference : 2년마다 개최하는 회의 = biannual conference
        tri-annual conference : 3년마다 개최하는 회의 = triannual conference
        quadri-annual symposium : 4년마다 개최하는 심포지움 = quadri annual symposium