Employment Service Act Article 42

To prioritize nationals’ employment rights, the employment of foreign workers must not adversely affect the employment opportunities, terms of employment, economic development, or social stability of nationals.
中文原文 就業服務法第42條
為保障國民工作權,聘僱外國人工作,不得妨礙本國人之就業機會、勞動條件、國民經濟發展及社會安定。

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