... every month(每月) every term(每学期) every year(每年) once a week (一周一次) twice a year(一年两次) 一般过去时表示过去发生的动作或存在的状态 She was at home yesterday.
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I go twice a year 我一年去两次
twice-a-year 一年两次的
Happening twice a year 一年两次的
fertilizing twice a year 全年两回施肥法
once or twice a year 一年一次或两次
Once and twice a year 一年一两次
visit them twice a year 一年看望他们两次
Most supervisory boards meet only twice a year.
大多数监理会一年只开两次会。
You should visit your dentist at least twice a year.
你应该每年至少去看两次牙科医生。
Their owners have clubs,magazines, a national association - even conventions,twice a year!
VOA: standard.2010.03.01
And he was sold for $1000.00 to an Alabama cotton planter who came up to Richmond twice a year to buy slaves.
他被以一千美元的价格卖给了一个每年两次,来里士满收购奴隶的亚拉巴马棉花种植主
which publishes twice a year, student written poetry and short fiction and plays.
这本杂志一年出两期,主要刊登学生们写的诗歌、短篇小说和戏剧。
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