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。
One banana plant usually produces fruit once a year.
一株香蕉通常一年结一次果。
He cleans his car once a week.
他每周洗一次汽车。
He comes to see us once a week.
他每周来看望我们一次。
我每周做一次有氧健身运动。
The village was once a pirates' lair.
这个村子曾一度是海盗藏匿之处。
The snake sheds its skin once a year.
蛇一年蜕一次皮。
Once a week, a maid changes the sheets.
女仆每个星期换一次床单。
Venice was once a city of rich merchants.
威尼斯曾是富商云集的城市。
We tend to meet up for lunch once a week.
我们往往会每周共进一次午餐。
I fill up the tank with gasoline about once a week.
大约每个星期我加满一箱汽油。
"Once a detective, always a detective," he said lightly.
他轻松地说：“一朝是侦探，终身是侦探。”
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。
The town's only claim to fame is that there was once a riot there.
这个镇唯一出名之处就是那里有过一次暴乱。
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。
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。
We water the flowers once a week.
我们每周给花浇水一次。
每周读一本书。
Hey, it's a once a year celebration!
嘿，这是一年一次的节日！
她曾经当过出纳员。
Hey, it's a once a year celebration!
嘿，这是一年一次的节日！
我们可以一年一起诉。
这里曾经是一片沙漠。
Once a year, the king made a new riddle.
国王每年都会编一个新的谜语。
So you have the competition once a year.
所以你每年有一次比赛。
Once a gentleman, and always a gentleman.
一日为绅士，终身为绅士。
We have to water this cactus once a month.
我们必须每月给仙人掌浇一次水。
Once a gentleman was traveling in a train.
从前，一位绅士坐火车旅行。
Once a bug is fixed, it is probably fixed.
一旦修订了错误，可能它就不变了。
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