The train operates the 2,400-mile round trip once a week.
这列火车每周进行一次2400英里的往返旅行。
Some birds which were once a common sight are now becoming rare.
有些曾经随处可见的鸟类现在日益稀少。
We water the flowers once a week.
我们每周给花浇水一次。
这里曾经是一片沙漠。
We have to water this cactus once a month.
我们必须每月给仙人掌浇一次水。
We tend to meet up for lunch once a week.
我们往往会每周共进一次午餐。
Venice was once a city of rich merchants.
威尼斯曾是富商云集的城市。
The village was once a pirates' lair.
这个村子曾一度是海盗藏匿之处。
He cleans his car once a week.
他每周洗一次汽车。
我每周做一次有氧健身运动。
The Tourist Board inspects all recommended hotels at least once a year.
旅游局至少每年视察一次所有举荐的旅馆。
It was once a forgotten world, a small village and its bell tower.
这个小村庄和钟楼曾经是一个被遗忘的世界。
她曾经当过出纳员。
There was once a wise old lady who lived on a hill.
从前有一位住在小山上的聪明老太太。
There was once a man who had a daughter who was called Clever Elsie.
从前有一个人，他有一个女儿，名叫聪明的爱尔莎。
I fill up the tank with gasoline about once a week.
大约每个星期我加满一箱汽油。
每周读一本书。
Hey, it's a once a year celebration!
嘿，这是一年一次的节日！
We need to watch an English film at least once a month.
我们需要至少每月观看一次英语电影。
The snake sheds its skin once a year.
蛇一年蜕一次皮。
About two-thirds of adults consult their doctor at least once a year.
大约三分之二的成年人一年至少看一次医生。
He comes to see us once a week.
他每周来看望我们一次。
Many people have made it a rule to detoxify once a year.
许多人已经养成了每年进行一次身体解毒的习惯。
So you have the competition once a year.
所以你每年有一次比赛。
Serpents cast their skin once a year.
蛇每年蜕一次皮。
The village has a fair once a month.
那村庄每月有一次集市。
The magazine comes out once a month.
这个杂志一个月出一期。
我每周同我爸通一回电话。
My mother cooks it once a week.
我妈妈每周都要做一次给我吃。
I travel overseas once a year.
我每年到海外旅行一次。
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