pond scum

uncountable

Algae, especially when growing on the surface of a pond. / Worthless, insignificant person or people.

Japanese Meaning

池の表面に生える藻類 / 価値がなく、取るに足らない人（または人々）

A thick layer of pond scum coated the surface, choking off oxygen for the fish below.

厚い藻の層が水面を覆い、下にいる魚の酸素を奪っていた。

Sense（1）

Algae, especially when growing on the surface of a pond.

Sense（2）

Worthless, insignificant person or people.