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Sheds only once a year during a 4 week time period. 掉毛时间为一次一年,但是时间长达4周。
But Christmas comes only once a year. 可惜每年只有一次啊!
Female pandas ovulate only once a year, in the spring. 一年雌熊猫仅仅在春天排卵。
Thoroughly clean the entire house,often done only once a year. 彻底地打扫房屋，经常是每年一次。
Only once a year, the couple could meet on the Milky Way. 牛郎与织女一年才能在鹊桥上相会一次。
Viticulture : Short pruning (double guyot); weeding only once a year, hand-picking with double sorting. 种植方式:单臂篱架，短梢修剪;隔行留草，手工精选采收
C) The holiday is coming to an end, this is a holiday nostalgia, because only once a year! 三)假期快结束了,很留恋这一个假期,因为一年才有一次嘛!
Mail comes to this remote village only once a week. 邮车每周只到这个偏僻的村庄一次。
Comprehensive Games only once a year, and in the course of each project are for college or grade units. 综合类运动会每年只有一次,而且每个项目开展过程中均以学院或年级为单位。
Going a step further, Katz suggests thinking about your investments only once a quarter or once a year. 另外，凯兹也建议大家只需要一季度或一年考虑一次投资就够了。
Mature Christmas Island red crabs probably moult only once a year, as their growth rate slows. 成年圣诞岛红蟹或许一年只蜕一次壳，因为它们生长缓慢。
They get together once a year at Christmas time. 他们每年圣诞节时聚会一次。
Which is better, a clock that is right only once a year, or a clock that is right twice every day? "The latter," you reply, "unquestionably." Very good, now attend. 两只手表哪一只表更好?一只表一年只准时一次的还是每天准时两次的?“后一个,”你回答,“毫无疑问的!”回答很好,但请留神。
Once a year a race is held for old cars. 每年举行一次旧式小汽车比赛。
The holidays can be stressful, no doubt about it: the crowds, the hassles, the cold weather, those annoying relatives you thankfully see only once a year. 假期可能会感到紧迫、毫无疑问：拥挤、争吵、寒冷，还有那些多亏一年只见一次面的烦人亲戚们。
The farmers here sow once a year. 这里的农民一年播一次种子。
We resolved to visit Europe at least once a year. 我们决定至少每年访问欧洲一次。
Even if this person can come only once a year, he or she can add much depth to the study, making suggestions about study materials, answering perplexing questions on content and so forth. 即使这个导师一年只能来一次，他或她也可帮你加深学习、提出学习材料方面的建议，回答一些令人困惑的问题等等。
It' s only a day' s sailing from here to Shanghai. 从这里去上海只有一天的航程。0?
Only once a year, on the day of atonement, the high priest was permitted to enter and only if he was sprinkled with the blood of the sacrifice as propitiation for himself and all the people. 只有大祭司可以一年一度在赎罪日先用血为自己和所有以色列民赎罪后，才准许进入至圣所。