The school syllabus seems aimed at the lowest common denominator.
學校的教學大綱似乎是針對接受能力最差的學生制定的。
?? 牛津釋義
denominator
n
(mathematics 數) number below the line in a fraction, showing how many parts the whole is divided into, eg 4 in 分母(如 中的 4). Cf 參看 numerator.