家庭聚餐玩手机可以用英文表示为 "using smartphones during family dinners"。这个短语的来源可能是因为越来越多的人在家庭聚餐时使用手机，以至于这个行为变成了一种普遍现象。

下面是一些例句及其中文翻译：

"I wish people would stop using smartphones during family dinners. It's so rude." (我希望人们不要在家庭聚餐时玩手机，这太无礼了。)
"It's hard to have a meaningful conversation when everyone is using smartphones during family dinners." (当每个人都在家庭聚餐时玩手机时，很难进行有意义的对话。)
"I think it's important to disconnect from technology during family dinners. It helps us be more present with each other." (我认为在家庭聚餐时暂时断开与科技的联系是很重要的，这能帮助我们更多地与彼此在一起。)