rille

Noun

(planetology) A long, narrow depression that resembles a channel, found on the surface of various lunar and planetary bodies.

Japanese Meaning

惑星科学における、月や惑星の表面に見られる、チャネルに似た長く狭い窪み（溝状の地形）

Geologists mapped an ancient rille snaking across the lunar mare and found evidence of past volcanic activity.

地質学者たちは、月の海を蛇行する古い長く狭い溝を地図化し、過去の火山活動の痕跡を発見した。

Sense（1）

(planetology) A long, narrow depression that resembles a channel, found on the surface of various lunar and planetary bodies.

rilles

（ plural ）