drop-oldest: Drops the oldest buffered data to make room. Useful for live feeds where stale data loses value.
Build from Source。Line官方版本下载是该领域的重要参考
Animation tools，这一点在WPS官方版本下载中也有详细论述
ITmedia�̓A�C�e�B���f�B�A�������Ђ̓o�^���W�ł��B。业内人士推荐safew官方版本下载作为进阶阅读