7 million tons of plastic is turned into bottles which are only used once each year.
每年有700万吨塑料被制成塑料瓶，而这些塑料瓶只被使用一次。
Most bags are only used once and can take up to 100 years to decompose.
最袋只用一次，就可以采取行动，以百年才能分解。
"Tesco carrier bag. Yes, one of the ones that was free a couple of weeks ago. Only used once!" it says.
其宝贝详情上写着：“特易购超市的塑料袋，只用过一次。对，这就是那种几周前还免费的塑料袋！”
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。
This test asserts that the network client is only used once by simply throwing an error from the network stub after the first use of it.
测试断言，网络客户端只被调用了一次，第一次使用之后网络stub就简单地抛出错误。
The average deep fryer uses almost an entire quart of oil, and if it is only used once, the cost of a batch of fries can amount to just as much as an entire restaurant meal.
平均每使用一次油炸锅会用去整整一品脱的油，如果这些油只使用一次，每一锅油炸食品的成本几乎等于在餐馆吃一顿饭的价钱了。
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。
While 70 percent of 8th and 10th grade students used to go to the movies once a month or more, now only about half do this.
过去，70%的八年级和十年级学生每月看一次电影，甚至更多，但现在只有约一半的人这样做。
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。
There can only be one transition out of the initial state, and the operation specified for this transition should only be used this once.
初始状态传出的转换只能有一种，而且为此转换指定的操作只应使用这一次。
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。
But in Korea, the only computers are older PCs, and they remain in the computer lab, which is used only once a week for computer class.
然而在韩国，唯一的电脑是老式的PC机，而且它们都放在计算机房里，只在一周一次的计算机课上才能用。
For example, you'll have plenty of results that have only been used once; you want to filter these out because just one use of a search term doesn't really show a trend.
例如，可能有很多结果只是用过一次，你应该将这些结果过滤掉，因为用过一次的结果并不能真是的反映出趋势。
A rule set can achieve the same results in a single operation, and if the same test is used in more than one rule in a rule set, it is still only evaluated once.
规则集可在同一操作中取得相同的结果，并且，如果规则集中多个规则采用了同一测试，该测试也仅评估一次。
One reason is that radars used to track storms can detect water in the atmosphere only once it has condensed into clouds or raindrops, and thus reflects the beam.
一个原因是被用来追踪雷暴的雷达只可以发现大气中凝结成云或雨滴的水，因为水能以这样的形态反射波束。
You have a scale that can be used only once. How can you find out which bottle contains the 9 gram pills?
只使用一次天平，如何找出盛有9克药的那一瓶？
Stateful command instances are generally used only once, or are pooled and recycled once the client is done with it.
有状态command实例通常仅仅使用一次，或者被放入池中，每次客户端使用完以后便回收。
Some yard equipment and home improvement tools get used only once or once in a while.
一些院子里的和改善住宅的工具往往只用一次或是一小段时间。
With both functions in a single environment, the service could be used only once, for the specific purpose it was designed for.
在单一环境中使用两种功能，该服务只能使用一次，因为它们都是为特定的用途设计的。
If transaction logging is used for backups, use this switch only before the full backup schedule (once a week).
如果事务日志用于备份，只在完全备份计划(每周一次)之前使用此开关。
To further secure the system, tokens only can be used once.
为了进一步加强系统的安全，令牌只能被使用一次。
But that requires such transplants to be healthy themselves-and each length of transplanted vessel can be used only once.
但这要求这样的移植对患者无害，而且每根移植的血管只能使用一次。
Designs are often used only once, most buildings are not energy-efficient, the industry produces a lot of waste, and many materials are simply thrown away.
设计通常只用一次，大部分建筑物不节能，建筑行业浪费严重，而许多建材简单地一扔了之。
One other weakness is that HTTP authentication makes no provision for how to establish the name and password used for a login, only for how to use them once they have been created.
另一个缺点是HTTP身份验证没有限制如何建立登录名和密码，它只控制如何使用登录名和密码。
One other weakness is that HTTP authentication makes no provision for how to establish the name and password used for a login, only for how to use them once they have been created.
另一个缺点是HTTP身份验证没有限制如何建立登录名和密码，它只控制如何使用登录名和密码。
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