指炎

例句：

1. 1. The sun is shining, so it must be a hot day.
   太阳在照耀，所以一定是个炎热的日子。
2. 2. He used his pen to sign the document as a substitute for himself.
   他用笔作为自己的替代，签署了文件。
3. 3. She dyed her hair with blue dye to create a new shade.
   她用蓝色染料染发，创造了一种新的颜色。