ballast石碴: ballast; ballast aggregate; ...道碴: ballast aggregate; ballast压: press; push down; hold down; ...压重物: ballast; kentledge后压重物: back lead weight下载手机词典可随时随地查词查翻译关注微信公众号：chachacidian，回复:石碴；道碴；压重物，即可在微信中查询翻译
