Usages of diàoxiàn
网络 总是 掉线。wǎngluò zǒngshì diàoxiàn.
The network always loses its connection.
这个 网络 今天 总是 掉线。zhège wǎngluò jīntiān zǒngshì diàoxiàn.
This network keeps dropping out today.
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We have an entire course teaching Chinese grammar and vocabulary.