held only once every 10 years 的中文意思是什么?held only once every 10 years——the World Philatelic Exhibition opened earlier this month in Washing D.C.的中文意思是什么?

held only once every 10 years 的中文意思是什么?held only once every 10 years——the World Philatelic Exhibition opened earlier this month in Washing D.C.的中文意思是什么? every和once的用法区别奥运会四年举办一次是：The Olympic games are held every four years.但是能不能说：The Olympic games are held once four years.有没有什么特定的规则呢? BE HELD EVERY 4 YEARS be held once for four years每四年举办一次以上说法哪个更准确 their birthdays only come _____ four years是填each,every还是once the Olympic Games are held once ___A every four years B .every four year C.every -four -year怎样区分呢?为什么B 不可以呢？Every week 后面也不加s啊？ once every 每年一次? 寻求答案及原因Is the World Cup __ held once every four years?A.constantly B.rarely C.properly D.commonly Put the numbers 1 to 9 in the blank.You can use every number only once. 翻译 CS CD上的you can only update once in every 60 seconds try again in 60 seconds 是什么意思? Once,only once in the beautiful Once in Every Life中文意思歌曲Once in Every Life 是Aselin Debison唱的 求歌曲意思歌曲：Once in Every Life专辑：Sweet Is the Melody歌手：艾丝琳作词：Once in every life love should leave you without a choiceWhere the only th you are only young once You Only Live Once 歌词 you meet only once a an opportunity knocks only once. an opportunity knocks only once. once a year,a race is held for old cars.这里的 is held 是怎么回事? put the numbers 1 to 9 in the blanks.you can use every number only once( ) 乘（ ）=（ ）乘（ ）=（ ）+（ ）+（ ）+（ ）