布什行政当局将古巴裔美国人前往古巴旅游的次数从每年一次削减为每三年一次，并且不遗余力地强化一项禁令，即禁止其他美国人前往古巴旅游。
George Bush's administration has cut family visits by Cuban-Americans, from once a year to once every three years, and has been zealous in enforcing a ban on travel to the island by other Americans.
参与者被随机地指定做一种每年一次共三次的影像学检查——低剂量螺旋CT或标准X射线胸透。
Participants were randomly assigned to receive three annual screenings with either the low-dose spiral CT or the standard chest X-ray.
在每年的十月至十一月间，当哈德逊湾上第一次结冰的时候，有约一千只世界上最大型的陆地食肉动物迁徙到这个“北极熊的首都”。
More than a thousand of the world’s largest land carnivores migrate through the “polar bear capital of the world” during October and November, when the first ice forms on the edge of Hudson Bay.
我们一直辛苦地为老人们服务，但哈林顿·琼斯夫人只是每年在圣诞节时才来一次，以示她的富有和大方。
We work hard for the old people all the time, but Mrs Harrington - Jones only comes round once a year at Christmas to play the lady bountiful.
这样的节日应该多多地举行，每年至少要举行一次这样盛大的节日，就用这样的方式在公众场合荣耀奎师那吧。
More and more these festivals may be held, at least a very large festival in a year, simply for glorifying Krishna in public places.
彻底地打扫房屋，经常是每年一次。
Thoroughly clean the entire house, often done only once a year.
很多游客一次又一次的来到约赛密地，每年有约四百万人来公园。
Many visitors come to Yosemite again and again. About four million people visit the park every year.
这又一次让我感到困惑，几年来我在不断地求知探索，母亲问过我好多次，而且每次她总是说。“你的答案不对，可是，你每年都变的越来越聪明了。”
Stumped again, I continued my quest for knowledge and over the years, Mother asked me a couple more times and always her answer was, "No, but you are getting smarter every year, my child."
这又一次让我感到困惑，几年来我在不断地求知探索，母亲问过我好多次，而且每次她总是说。“你的答案不对，可是，你每年都变的越来越聪明了。”
Stumped again, I continued my quest for knowledge and over the years, Mother asked me a couple more times and always her answer was, "No, but you are getting smarter every year, my child."
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