可見一斑 [－见－－]

Jyutping ho2 gin3 jat1 baan1
Pinyin kě jiàn yī bān

Definitions (粵典–words.hk)
  1. 語句
    知道​事物​嘅​一小部分​就​可以​推論​到​佢​嘅​全貌
    get a rough idea of something
Definitions (Wiktionary)
  1. phrase, idiomatic
    to be able to deduce the whole picture of a matter from one small detail