placeholder

placeholder汉语翻译：
n. 占位符
【计】 占位符英语解释：
名词 placeholder:

a person authorized to act for another同义词：proxy, procurator

a symbol in a logical or mathematical expression that can be replaced by the name of any member of specified set

详细解释：
place.hold.er
n.（名词）
One who holds an office or a place, especially:
占位的人：处于某一职位或位置的人，尤指：
One who acts as a deputy or a proxy.
代理：做代理或委托的人
One who holds an appointed office in a government.
任职：在***机构被委认某职的人
In a mathematical or logical expression, a symbol that may be replaced by the name of any element of a set.
占位符号：数学或逻辑用语，可以用其它元素的名称代替的符号
In the decimal form of a number, a digit that is not significant.
占位符号：在一个数的小数形式中，没有意义的数字