arc

弧、曲線

弓のように曲がった形や通り道。

やさしい英語で： A curved shape or path.

• The ball flew in a high arc.
• She swung the rope in a wide arc overhead.
• Two graceful arcs of water crossed above the fountain.

使い方： in an arc (The ball flew through the air in an arc.)

類義語： curve

よく使う表現： wide arc, in an arc

弧、円弧

円の周りの線や、ほかの曲線の一部分。

やさしい英語で： A section of the curved line around a circle or along another curve.

• Draw an arc on the paper.
• The arc covers ninety degrees of the circle.
• We measured the lengths of two arcs.

使い方： an arc of a circle (Draw an arc of a circle with a radius of five centimeters.)

よく使う表現： arc of something, circular arc

電弧、アーク

二つの点の間の隙間を通る、明るく光る電気の流れ。

やさしい英語で： A bright stream of electricity passing through a gap between two points.

• An electric arc flashed between the wires.
• The welding arc was too bright to look at.
• A damaged cable produced several dangerous arcs.

類義語： electric discharge

よく使う表現： electric arc, welding arc

天球上の弧

太陽や月、星が空を移動するときに描くように見える曲線。

やさしい英語で： The curved path that the sun, moon, or a star seems to follow across the sky.

• The sun follows a low arc in winter.
• The astronomer calculated the arc of the star above the horizon.
• Long summer days give the sun a wider visible arc.

よく使う表現： diurnal arc, nocturnal arc

弧を描く

曲がった通り道に沿って動く。

やさしい英語で： To move along a curved path.

• The ball arced through the air.
• Water arced over the flowers.
• A shooting star was arcing across the dark sky.

使い方： arc over something (The ball arced over the goalkeeper.); arc across something (A jet of water arced across the garden.)

類義語： curve

よく使う表現： arc across something, arc through something, arc over something

アークを発生する

電気が明るく光りながら隙間を飛び越えて流れる。

やさしい英語で： When electricity does this, it passes through a gap as a bright stream.

• The damaged wire began to arc.
• Electricity arced across the small gap.
• Current was arcing between the metal contacts.

使い方： arc between A and B (Electricity arced between the two exposed wires.); arc across something (The current arced across the gap.)

類義語： spark

よく使う表現： arc across something, arc between something