ballast
习惯用语be in ballast1.■只装 压船物而没装货; 压舱航行2.■[喻]沉着, (为人)可靠have no ballast1.■不镇定, 不沉着mental ballast1.■心理[性格]上的稳定性特殊用法bottom ballast1.■底碴boxed-in ballast1.■轨枕间道碴crushed stone ballast1.■碎石道碴foul ballast1.■泥污碴床high-tension mercury lamp ballast1.■高压水银灯镇流器incrusted ballast1.■混碴lead ballast1.■铅压载low-power-factor mercury lamp ballast1.■低功率因数水银灯镇流器pit-run gravel ballast1.■坑砾道碴, 未筛砾石道碴rear-wheel ballast1.■后轮配重solid ballast1.■固体压载variable ballast1.■可变压载water ballast1.■【船】水压载