Both the passages and the questions will be spoken only once.
短文和问题只念一次。
Both the conversations and the questions will be spoken only once.
对话和问题仅读一遍。
Both of these scenarios imply that specialization to each niche occurred only once.
这两套不同的理论都意味着，适应不同的栖息地生活环境的这一过程只发生了一次。
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。
Each choice should be used only once.
每个选项只能选一次。
They are easy to break, most of them can be used only once.
它们很容易损坏，大多数只能使用一次。
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。
Radars used to track storms can detect water in the atmosphere only once it has condensed into clouds or raindrops.
用于跟踪风暴的雷达只能在大气中凝结成云或雨滴后才能够探测到水。
To guarantee that the header is processed only once in a given source file, we start by testing the #ifndef.
为了保证头文件在给定的源文件中只处理过一次，我们首先检测 #ifndef。
我只打过一次高尔夫球。
The demographic dividend comes around only once.
人口红利仅此一次，失不再来。
Shoppers pay only once they have received the goods.
购物者则在收到商品后才付钱。
Don't worry, it will download only once, not three times!
不要担心，将仅仅下载一次，而不会下载三次！
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。
Yak conveyance from Lhas to Yaan was only once a year.
从拉萨到雅安的牦牛运输，一年只能往返一次。
It also makes sure dependencies are loaded once and only once.
它也确保依赖项已经加载一次，且仅加载一次。
Only once things had settled down could the survivors regroup.
只有当事态得以解决时幸存者才能重组。
He spoke warmly of Barack Obama, although he has met him only once.
他高度评价奥巴马，尽管他与奥巴马只有一面之缘。
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。
This is typically used when statements have to be executed only once.
这种方法通常在语句只需要执行一次时使用。
Because the codes were used only once, they were virtually unbreakable.
因为密码仅使用一次，因此它几乎是无法被破解的。
A bull market needs to be fed every day, a bear market only once a week.
牛市需要每天为它提供给养；熊市只需要一个星期为它提供一次给养。
Such an unassailable, unconditional and seamless love happens only once.
如此不容置疑的、无条件的、天衣无缝的爱一生只会出现一次。
"If it was the right thing to do, why did they do it only once?" he asked.
“如果紧急援助是一件正确的事情，他们又为何只做一次？”他问道。
Mr Wolfowitz apologised for his indiscretion only once during the meetings.
沃氏只是在会议期间为他的轻率之举道过一次歉。
Evaluating scalar values early enables optimization by doing things only once.
尽早对标量值求值可以通过只执行一次操作来实现优化。
Pages and page fragments are invalidated only once, rather than once per JVM.
页面和页面碎片仅作废一次，而不是每个J VM一次。
Components that typically appear only once in a pattern do not have quantity spinners.
模式中通常仅出现一次的组件没有数量调节按钮。
Only once she had left did she realise this was a mistake: she missed office life.
然后她意识到选择离开是个错误，因为她想念办公室的生活。
Only once she had left did she realise this was a mistake: she missed office life.
然后她意识到选择离开是个错误，因为她想念办公室的生活。
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