此外，移动电话费也成为一个学生的家庭沉重的负担。

In addition, mobile phone bill is also a heavy burden on students' families.

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但是移动通信仍然存在着信号不稳定，话费较贵的缺点。

However, the unstable signal and more expensive charges still exist.

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但是移动通信仍然存在着信号不稳定，话费较贵的缺点。

However, the unstable signal and more expensive charges still exist.

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