Regulations for Passenger Ship Administration Article 17

The term "steerage cabin" when used herein shall mean cabins with more than twelve fixed berths or ground berths, movable berths, reclining chairs, sitting chairs and benches or open cabins used exclusively for passengers.
中文原文 客船管理規則第17條
本規則所稱統艙,指設有超過十二個固定床位或設有地舖、活動床舖、坐臥兩用椅、坐椅、長凳等,或為敞艙,專為乘客搭乘之艙室。

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