在这些情况下，会从型别转换函式传回预设值。
In these cases, a default value is returned from the type conversion function.
此函式可将元素增加在指定的阵列后面，如果你增加的是字串值的话，则字串值会变转换成阵列值然后加在原来阵列的后面。
This is used to append an element to an assigned array. If you append to a string value, it is converted to an array value and then appended to.
转换运算子和建构函式已经定义为产生相同的转换。
A conversion operator and a constructor have been defined making the same conversion.
传递给这个函式的整数索引表示要进行转换之项目的索引(从0开始)。
The integer index passed to the function indicates the index (from 0) of element being transformed.
传递给这个函式的整数索引表示要进行转换之项目的索引(从0开始)。
The integer index passed to the function indicates the index (from 0) of element being transformed.
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