rust

さび

鉄や鋼が空気や水と反応して、表面にできる赤茶色の物質。

やさしい英語で： A red-brown substance that forms on iron or steel when it reacts with air and water.

• The gate is covered in rust.
• He removed the rust from his bicycle chain.
• There are patches of rust on the old car.

よく使う表現： covered in rust, remove rust, patch of rust, rust on steel

さび病

菌が原因で、葉などに赤茶色の斑点がよくできる植物の病気。

やさしい英語で： A plant disease caused by a fungus that often leaves red-brown spots on leaves.

• Rust damaged the wheat crop.
• These orange spots are signs of rust.
• The gardener treated the roses for rust.

よく使う表現： wheat rust, leaf rust, rust disease

さび、酸化被膜

鉄以外の金属が空気や水と反応して、表面にできる物質。

やさしい英語で： A substance that forms on a metal other than iron when it reacts with air or water.

• Green rust covered the copper plate.
• She removed the rust from the brass fitting.
• Copper rust had changed the statue's colour.

類義語： corrosion

よく使う表現： copper rust, green rust, rust on copper

さびる

鉄や鋼が空気や水と反応して、表面に赤茶色の層ができる。

やさしい英語で： To develop a red-brown surface as iron or steel reacts with air and water.

• Iron can rust.
• The old gate rusted in the rain.
• Keep your tools dry so they do not rust.

類義語： corrode, oxidize

よく使う表現： rust in rain, begin to rust, rust over time, rust in water

さびさせる

水や空気との接触によって、金属の表面に赤茶色の層を作る。

やさしい英語で： To make metal develop a reddish-brown layer through contact with water or air.

• Rain can rust metal.
• The salty water rusted the hinges.
• Damp air has rusted all our tools.

類義語： corrode

よく使う表現： rust metal, rust the iron