文中还指出了在使用中应注意的一些问题。
国际电信联盟估计现在全球在使用中的手机有46亿部。
The International Telecommunications Union estimates that 4.6 billion mobile phones are in use at the moment.
B：我们需要知道产品在使用中可以有多长的寿命。
B: We need to know how long this product will last in the field.
电脑桌和迷你支架让笔记本电脑在使用中更加符合人体工学。
Lapdesks and mini-stands make laptops more ergonomic on the go.
当链接安全性在使用中时，所有请求都获得一个由链接用户ID定义的授权。
When link security is in use, all requests are given an authority defined by the link user ID.
应用程序在使用中，“操作栏”将始终显示，不过它的内容、主题和其他属性将由应用程序而不是系统来管理。
The Action Bar is always present when an application is in use, although its content, theme, and other properties are managed by the application rather than the system.
今时今日，全球约有50亿部手持设备在使用中，这使有些人相信，手机数量的增加有害人类健康。
Today, nearly five billion handsets are used around the world, leading some to believe the increase in devices harms people's health.
这里的公路就破损得非常厉害了，以至我常常能超过那些装饰得花花绿绿的卡车。1960年代从英国进口的贝德福德卡车仍可以见到在使用中。
Here it had deteriorated so badly that I could often overtake the fabulously ornate "jingly jangly" wagons - Bedford lorries imported from Britain in the 1960s and still in service.
该校自1883年以来一直在不断使用中。
这份地图所使用的符号全部列在索引中。
处理闰年相当简单——如果使用公历，在以年月日为时间间隔的计算中添加额外的一天。
Handling leap year is fairly straightforward—add an extra day, if using the Gregorian calendar, to the year-month or day interval calculations.
莫尔斯是海象出现之前的另一个名字，且似乎已经传播到其他语言，唯独在英语中却不再使用。
Morse was yet another name that appeared before walrus and seems to have spread to other languages only to drop out of use in English.
作者以拨浪鼓为例，说明了在玩具制作过程中，材料的使用具有连续性。
The author uses the example of rattle to show that in toy-making there is a continuity in the use of materials.
你问，怎样在昏暗环境中避免使用闪光灯？
多诺万相信在间谍活动的“大型游戏”中可以使用任何工具，因为间谍活动是一种“职业”。
Donovan believed in using whatever tools came to hand in the "great game" of espionage — spying as a "profession."
教给学生一些方法，让他们在整个学习过程中可以反复使用。
Students are taught a number of skills that can be reapplied throughout their studies.
他们使用新型枪支，鸟类在飞行中很容易被击落，而且数量很大，以至于商业捕猎鸭鹅成了一种行业。
They use new types of guns, and birds could easily be shot down in flight, and in such great numbers that commercial hunting of ducks and geese became an industry.
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