英['bæləst]美['bæləst]
记忆方法
词源词根法
古代人在使用帆船航行时发现,如果船底太轻,帆船很容易被风刮得东倒西歪,无法稳定行驶。因此,为了增加帆船的稳定性,他们会在帆船底部放置一些重物。如果船上的货物已经全部卖出,就只能用一些无用的重物如石头来压在舱底。这种没有价值的压舱物在英语中就叫做ballast,在古英语中由bar(=bare,空的,光的,无用的)+last(=load,负载)构成,字面意思就是bare load(无用负载)。在修建铁路时,需要在路基上铺上道渣碎石来压实路基土方。这种道渣碎石也可以称为ballast。=ballast['b?l?st]n压舱物,压载物,道渣碎石vt.给……装压舱物,给……铺道渣
谐音记忆法
可用谐音法,谐音:白拉石头。这些石头白拉的,不为卖钱而是为了保持车船的稳定的—-(船等)压舱物。
noun(名词)
双解例句
noun(名词)
小知识
A ballast is any heavy material that helps to make a ship or plane stable, including metaphorical ships like your mood. If you hate school, the thought of a weekend coming might be a ballast for your mood.
Ballast comes from old ship terminology for cargo. It came to mean the weight of the cargo that prevents the ship from rocking around on the open seas. Any craft, ship or plane, needs ballast. A weight on the bottom of a rocket might act as ballast to help it glide straight. If you’re driving in snow in a tiny tin can car, you’ll need to ballast, or add weight, to prevent the wheels from sliding around.
实用短语
常用短语
单词用法
词组短语
electronic ballast电子镇流器;电子安定器;ballast water压载水;压舱水;压舱配重水
词根词缀
后缀: -ast
表名词,”……人,物”
n.
ballast [船等]压舱物ball球,重物+ast……人,物→n.[船等]压舱物