--- Hash[key,value,...]
--- Hash[hash]

    ϥåޤܤηǤϡɬĻ
    ʤФʤޤ(ܤܤ)

    ܤη(1ĤΥϥå奪֥Ȥ˻ꤷ)ϡ
    ꤷϥåƱΥͤĿʥϥå֤
    (줿ϥåΥǥեͤ nil Ǥ)

