Civil Associations Act Article 31

The directors or supervisors of a civil association shall personally attend the meetings of the board of directors or the board of supervisors, and may not entrust others to represent them. Absence without due reason for two consecutive times will be regarded as resigning, and the vacancy will be filled by the alternate directors or alternate supervisors in sequence.
中文原文 人民團體法第31條
人民團體理事、監事應親自出席理事、監事會議,不得委託他人代理;連續二次無故缺席者,視同辭職,由候補理事、候補監事依次遞補。

English translation for reference only; the Chinese text prevails. Not legal advice.