facial square root 2 proportion

例句：

1. 1.She was wearing a facial mask when she arrived at the party.
   她到达派对时戴着口罩。
2. 2.The facial expression on his face showed his surprise.
   他脸上的表情显示出他的惊讶。
3. 3.The facial recognition technology is still being developed.
   面部识别技术仍在发展中。