Discussion of 关手机/關手機 [guān shǒu jī] to turn off the cellphone - Trainchinese

1 - I don't see any sentence examples for the words I lookup. Why is that? There were sentence examples in the past.在检索词汇时，我未能发现任何相应的句子示例。这是为何？往昔曾有所见之例句。