ballast
🇺🇸
/ˈbæləst/
🇬🇧
/ˈbæləst/
Heavy stuff put on a ship or in a hot-air balloon to make it steady and less likely to move around.
The crew loaded the ship with ballast to prevent it from tipping over in rough seas.
乗組員は荒海で転覆するのを防ぐために船にバラストを積み込んだ。
Stones or other material laid down to make a strong base for roads, railways, or other structures.
Workers spread ballast over the area to stabilize the railway tracks.
作業員は鉄道の線路を安定させるためにその地域にバラストを敷き詰めた。