ballast

バラスト、重し

船や気球を安定させたり、つり合いを調整したりするための重い材料。

やさしい英語で： Heavy material put in a ship or balloon to keep it steady or control its balance.

• The ship carries ballast for balance.
• They added sand as ballast to steady the boat.
• The balloon rose after the pilot released some ballast.

類義語： stabilizing weight

よく使う表現： water ballast, carry ballast, release ballast

道床砕石、バラスト

線路や道路の下に敷いたり、コンクリートに混ぜたりする粗い石。

やさしい英語で： Rough stones laid under railway tracks or roads, or used in concrete.

• Workers spread ballast under the tracks.
• The ballast helps rainwater drain away.
• Fresh ballast was laid along the repaired railway line.

類義語： track gravel

よく使う表現： railway ballast, track ballast, lay ballast

バラストを積む

船などに重い材料を載せて安定させる。

やさしい英語で： To put heavy material in a ship or other object to make it steady.

• They ballast the boat with sand.
• The crew ballasted the ship before departure.
• We need to ballast the vessel evenly.

使い方： ballast something with something (They ballasted the boat with bags of sand.)

類義語： weight, stabilize

よく使う表現： ballast a ship, ballast with something, ballast a boat