4.practically every teenager and many small children in Europe have (usually prepaid) mobile phone so their parents can locate them, without the danger of the child running up a huge bill. If the mobile phone is used only occasionally, its use is essentially free since there is no monthly charge or charge for incoming calls.
4.几乎所有欧洲的少年和小孩子都持有移动电话(通常是预付费的),所以他们的家长可以找到他们,而不用承担孩子会欠巨额账单这样的风险。如果你只是偶尔使用移动电话,它用起来几乎是免费的,因为没有月租费,接听也不需要收费。
5.An integrator is the simplest filter mathematically, and it forms the building block for most modern integrated filters.
5.从数学公式上讲,积分器是最简单的滤波器;它是构成大多数现代集成滤波器的基本模块。
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