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。
The password is used once to generate a token.
使用一次口令以生成令牌。
In any given company, applications are often used once.
在任何一家公司，应用通常使用一次。
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。
Add-content-to-section: This mode is very similar to the first mode, and is used once in a section.
add - content - to -section：与第一种模式非常类似，在每节中使用一次。
Most of these files are secondary and may only be used once or twice but they come in very handy.
多数这些文件都是次要的，也许您只用得上一两次，但他们很容易获得。
Ejector seat levers can only be used once, and their consequences are significant and irreversible.
弹射座椅操纵杆只能用一次，它的使用将引起重要的变化，而且这个。
"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！”
It is important to note that this action is very rarely undertaken and in recent years has only been used once.
非常重要的一点是：拆迁手段的使用机会微乎其微，而且近年以来只用过一次。
The total refund amount will be offset against your first purchase in VRC PRO, this refund can only be used once.
总的退款金额将冲抵你的第一个购买添加专业，这笔退款只能使用一次。
From this perspective, unused functions should not be dropped from software merely because they are used once in a blue moon.
从这个观点来说，不习惯使用的功能不应该仅仅从软件中去除因为他们往往给使用他们的用户一种千载难逢的感觉。
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。
Small amounts applied to the skin -such as a salicylic acid-containing toner used once or twice a day -are considered safe, says Johnson.
少量涂抹在皮肤上——比如每天使用一到两次含水杨酸的爽肤水被认为是安全的。Johnson说道。
Small amounts applied to the skin - such as a salicylic acid-containing toner used once or twice a day - are considered safe, says Johnson.
少量涂抹在皮肤上——比如每天使用一到两次含水杨酸的爽肤水被认为是安全的。Johnson说道。
Here stands Columbus, whom the street boys used once to follow and jeer, because he wanted to discover a new world; and he has discovered it.
现在站在我们面前的是哥伦布，正因为他想发现一个新世界而已经发现这个新世界，一群街头玩童一度追逐着嘲笑他。
Like any other modern device which takes loads of energy to make and only get used once before being dumped, disposable cameras are rather wasteful.
想其他花费大量能源却一次性的现代器械一样，拍立得相机是一种浪费。
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。
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。
Once, people used too much underground water.
过去，人们使用了太多的地下水。
Once the session was over, this person was asked to identify which of the four images had been used.
会议一结束，这个人就被要求辨认四张图片中哪一张被使用过。
It is known as the music room because once it was used for music lessons.
它被称为音乐室，因为它曾用来上音乐课。
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。
This used to be an agricultural area and we already know that where the main lecture hall now stands, there once were farm house and barn that were erected in the late 1700s.
这曾经是一个农业区，我们已经知道，现在主演讲厅所在的地方曾经有建于18世纪晚期的农舍和谷仓。
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