shān / qū / de / shǒu / jī / xìn / hào / shí / xiǎn / shí / yǐn / tōng / huà / hěn / bù / wěn / dìng

山区的手机信号时显时隐，通话很不稳定。

Mobile phone reception in the mountain area was intermittent, making calls very unstable.