That happened once with the videogame system, my friend says, 'but only once.
我的朋友说，买游戏机的时候出现过一次这样的事，不过只有一次；
Sometimes there were negotiations about the rules, but only once did the guy present to me a prepared list of rules of his own.
有时我们也会就规则进行谈判，但只有一个人向我提出了他自己准备好的原则清单。
Now, if you run the form, you'll still see the alert box, but only once, because the new value is allowable according to the schema.
这时再运行表单，我们仍然会看到警示框，不过它只会出现一次，因为根据模式新值是允许输入的。
Some students prefer to study for very long time but only once during a week. Others prefer to study for several short times during a week.
一些学生喜欢每周学习一次但是持续时间很长，另一些学生喜欢每周利用零散的时间学习很多次。
I was, on occasion, shocked by what I read, and I learned some things I never knew I never knew, but only once did I make the comment that a line was too crass.
偶尔地，我被我读到的震惊，我知道了也许从不会知道的东西。
We're not sure if those folks are now having regrets about their choices, but if so, they'll be happy to know they now have the option to select a username yet again. But only once, says Facebook.
我们不知道这些家伙现在是否后悔当初的选择，不过如果他们后悔了的话，下面这个消息对来来说可是个好消息，现在他们可以重新在选取一个用户名，但是Facebook称，只有这一次反悔的机会。
Article 6 This contract can be modified but only once every year, since the signing date of the contract, based on two parities' negotiation when company suffers from force majeure or big changes.
第六条本合同签订后，遇有不可抗力或企业经营状况发生重大变化，双方可协商修改合同，但每年只能一次。
An episode of major depression may occur only once in a person's lifetime, but more often, it recurs throughout a person's life.
重度抑郁发作可能在一个人的一生中仅出现一次，但更经常的是，它在一个人的一生中反复出现。
He once told me that he was very nervous at first. He was not only trying to learn this hard new job but also a new language.
他曾经告诉我他一开始很紧张。他不仅在努力学习这一艰难的新工作，而且在努力学习一门新的语言。
The shopping mall has been open for two years, but I have been there only once.
这个购物中心开业两年了，但我只去过一次。
Between 1984 and 1993, he once tried to save four fish, but only one stayed alive and returned to the river.
在1984年至1993年期间，他曾试图拯救四条鱼，但只有一条活了下来，并返回河中。
According to a study by Australian National University, Australian children and Chinese children have the same level of eyesight before they start school, but once they enter primary school, Chinese children only spend about an hour a day outside, while Australian children spend three to four hours each day in the sunshine.
澳大利亚国立大学的一项研究显示，澳大利亚的孩子和中国的孩子在入学前的视力水平相同。但是一旦他们进入小学，中国的孩子每天只会在户外度过一个小时，而澳大利亚的孩子每天在阳光下待三到四个小时。
As a special accommodation, we agree to your D/P payment terms, but only for once.
作为通融，我方同意你方采用付款交单方式，但仅此一次次。
You can see or do something a million times, but you can only see or do it for the first time once.
你可以看到或者尝试去做一件事很多很多次，但是你初次看到或者初次尝试的机会只有一次。
Password expiry is only used once but I like to create a variable for it and place the variable with the other user-edited fields.
密码期限只使用一次，但是我喜欢为它创建一个变量，并将变量与其他的用户可编辑字段放置在一起。
Since there is only one additional machine in our network, we need to copy the configuration over only once, but you could repeat the process for each machine in your network.
由于我们的网络中只有一台额外的机器，我们只需复制配置一次，但您可以针对您的网络中的每台机器重复这个过程。
We internally activate many thoughts at once, but we can retrieve only one at a time.
我们能一次激活许多不同的想法，但只能集中注意力思索其中的一个。
In addition, this database allows each piece of information to be stored only once but referenced from many different contexts.
此外，该数据库对于每个信息只存储一次，但从不同的上下文中进行引用。
However, the nutrient solution is not circulated but used only once.
不过，营养液是不能循环使用的，只能用一次。
Reusing content is easy and highly scalable because a resource can be linked to many times, but it can only be downloaded once.
重用内容很容易，具有很高的伸缩性，因为资源可以链接很多次，但是只需要下载一次。
The tulou once housed 100 families, but only 10 or so people live here now.
这座土楼曾经住过100个家庭，但现在只剩下十多个人。
However, sometimes you might prefer to specify a range but then have the function called only once, and then handle the range semantics within the function itself.
然而，有时希望指定一个范围，但是只调用一次函数，然后在函数内部处理范围语义。
PI : Only once, but it wasn’t at a high level cometition.
PI：只有一次，不过那不是一个高水平的比赛。
Splash screens are bad enough when they sit in front of a site's real homepage, but at least users encounter those screens only once.
用这种卖弄的画面做网页主页糟糕透顶，不过用户最多只遇到一次这种情况。
Many hours have passed and my only company was "just a dog," but I did not once feel slighted.
在仅有“区区一只狗”陪伴的数小时里，我从未感到过被忽视。
My friend answered, "I can have three or four weddings. But a prom you do only once."
我朋友回答到：“我能办三到四趟婚礼，但是毕业舞会一辈子只有一次。”
My friend answered, "I can have three or four weddings. But a prom you do only once."
我朋友回答到：“我能办三到四趟婚礼，但是毕业舞会一辈子只有一次。”
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