Given their low incomes, only about a quarter of Ugandans have a mobile subscription, but street vendors offer mobile access on a per-call basis.

由于收入低下，只有约四分之一乌干达人拥有手机，但是街头小贩们提供按通话付费的手机服务。

youdao

Note that this caching provider assumes that the arguments have string representations that are unique, but not unique per call.

请注意这个高速缓存提供程序假定变元有唯一的字符串表示，但不是每一个调用都有唯一的字符串表示。

youdao

Another option is to have one call per record, as shown in Listing 10.

另一种方式是为每条记录采用一个调用，如清单10所示。

youdao

This is known as the pay-per-call model.

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We could live without the 95-cent-per-minute charge to call the horticulture advice line.

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