再说，手机屏幕那么小，看不清楚字的时候，我们会眯眼，然后眉间纹也出来了。
zài shuō ，shǒujī píngmù nàme xiǎo ，kàn bu qīngchu zì de shíhou ，wǒmen huì mīyǎn ，ránhòu méijiānwén yě chūlái le 。
And what's more, because the screens of cell phones are so small, you have to squint when you can't make out the characters, so your frown lines will become more pronounced too.