Value函数的语法为：value (text) value函数只有一个参数text：表示需要转换成数值格式的文本字符串。此参数可以是带双引号的文本（如value (120),value (560))，也.
Rare Australian 50c coin goes for far more than face value but the
What Is The Value Of A 50 Cent Coin Unveiling Its Worth Beyond Face Value 1964 Collectors Weekly
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