你可以用英文表达 "fear written all over one's face" 来形容一个人的脸上写满了害怕的感觉。

这个短语的来源可能是源自于人们通常可以从一个人的面部表情中看出他或她的感受和情绪。当一个人感到害怕时，他们的脸上往往会出现明显的痕迹，比如皱眉、皱眼、张开嘴巴等。

下面是一些例句：

She had fear written all over her face when she saw the snake in her garden.（当她看到花园里的蛇时，她的脸上写满了害怕。）
I could tell he was lying because fear was written all over his face.（我知道他在撒谎，因为他的脸上写满了害怕。）
His face was pale and fear was written all over it when he came home late at night.（当他深夜回家时，他的脸色苍白，脸上写满了害怕。）