Teacher Education Act Article 12

If a person who has already obtained a Teacher’s Certificate qualifying them to teach one of the subject areas referred to in Article 7, completed the Pre-service Teacher Education Courses for teaching in another subject area and obtained a certificate or other proof, shall be issued a Teacher’s Certificate for that second subject area by the Central Competent Authority in accordance with the prescribed regulations referred to in Paragraph 2 of the previous article, and will be exempted from taking a Teacher Qualification Assessment in accordance with the regulations.
中文原文 師資培育法第12條
已取得第七條其中一類科合格教師證書,修畢另一類科師資職前教育課程,並取得證明書或證明者,由中央主管機關依前條第二項所定辦法發給該類科教師證書,免依規定參加教師資格檢定。

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