ごく一いち部ぶ

expression, noun

very small fraction; tiny part; very small proportion

Emphasizes that only an extremely small portion of a whole is involved. Often used with ～に過ぎない or ～しかない.

• 応おう募ぼ者しゃのごく一いち部ぶしか選えらばれない。

  Only a very small fraction of applicants are selected.

• この問もん題だいを理り解かいしているのはごく一いち部ぶの人ひとだけだ。

  Only a tiny proportion of people understand this problem.