placeholder

placeholder

Noun:

1. a person authorized to act for another
   
2. a symbol in a logical or mathematical expression that can be replaced by the name of any member of specified set
   

用作名詞 (n.)

1. Place the name of the matrix in the placeholder.
   在占位符處輸入矩陣的名字。
   
2. You can replace the placeholder text with your own content.
   您可以用自己的內容替代占位符文本。