ray

光線、放射線

光やエネルギーが発生源から細い筋となって進むもの。

やさしい英語で： A narrow line of light or energy moving out from a source.

• A ray of light reached the floor.
• The sun’s rays warmed my face.
• These rays can pass through some materials.

使い方： a ray of light (A ray of light came through the curtains.)

類義語： beam

よく使う表現： ray of light, sun ray

エイ

幅広く平たい体と大きな胸びれを持ち、普通は細長い尾がある海の魚。

やさしい英語で： A wide, flat sea fish with large side fins and usually a long, thin tail.

• A ray swam past us.
• We saw rays at the aquarium.
• The ray rested on the sand.

よく使う表現： manta ray, ray swimming

半直線

一点から始まり、一方向に限りなく伸びるまっすぐな線。

やさしい英語で： A straight line that begins at one point and continues forever in one direction.

• Draw a ray from this point.
• The two rays form an angle.
• Each ray has just one endpoint.

よく使う表現： draw a ray, ray endpoint