Append the value to the hash value keyed on the field name if it already exists, as this will enable the simple print out of every combination of the field no matter which of the fields matched. 如果值存在,则将其追加到与字段名关联的散列值后,因为这样做将启用每个字段组合的简单输出,而不管哪些字段匹配。
Reversing the polarity of a key, such that material formerly keyed out will be keyed in, and vice versa. 反转一个键的性质,这样一来素材中先前是键出的将变为键入,反之亦然。