x No Plagiarism!tOn50slz5kmcjhQYf2xrposted on PENANA 原子筆的筆芯放在水下,筆尖會自動朝下,並且整支筆芯會垂直於地面。8964 copyright protection287PENANAdHwWgMsbKn 維尼216.73.216.138ns216.73.216.138da2