| 释义 |
〔placeholder〕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〔placeholder〕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 |