Regulations for Academia Sinica Council Meetings Article 6

Council Members who are unable to attend a meeting shall not authorize others to attend on their behalf. However, for specific matters, a Council Member may authorize another Member in writing to cast a vote on their behalf. Each Council Member may represent only one other Member at a time.
中文原文 中央研究院評議會會議規則第6條
評議員因故不能出席時,不得委託他人代表。
但對於某特定事項,得以書面委託其他評議員代表投票,每一評議員,同時僅能代表一人。

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