(pos:名詞)<explanation>yue:學術上有根據、有系統嘅理論或者主張（量詞：門）eng:theory; doctrine<eg>yue:關於生命嘅起源，有好多唔同嘅學説。 (gwaan1 jyu1 sang1 ming6 ge3 hei2 jyun4, jau5 hou2 do1 m4 tung4 ge3 hok6 syut3.)eng:There are a multitude of theories concerning the origin of life.