Here in the US, for example, 3g coverage is spotty outside urban areas, leading to intermittent connection issues and slow speeds.

比如，在美国，3g在市区之外的覆盖就是参差不齐的，会导致间歇式连接和慢网速的问题。

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Although there is mobile phone coverage over most of the course, there are some areas where coverage is either non-existent or intermittent.

大部分赛道均属手提电话网络覆盖范围，惟也有部分地区并无网络覆盖或存在接收讯号断续情况。

youdao

Although there is mobile phone coverage over most of the course, there are some areas where coverage is either non-existent or intermittent.

大部分赛道均属手提电话网络覆盖范围，惟也有部分地区并无网络覆盖或存在接收讯号断续情况。

youdao