4周搞定2000+托福核心词
imball = im(不) + ball(抛) = 不平衡，不安定
gymnastium = gymn(裸体的) + ast(人，物) + ium(名词) = 体育馆
gymnastics = gymn(裸体的) + ast(人，物) + ics(学科) = 体操
抛下的物体→被承载→承载物
ballast
常考释义
n. 压舱物；压载物
Historically, stone was used by sailors in the 1800s for ship ballast.
在历史上，石头在19世纪被水手用作船只的压舱物。
If the ballast water is emptied halfway of the journey and refreshed with sea water, the zebra mussels can be exterminated as soon as they get exposed to salt water.
如果压舱水在旅程的中途被清空，并且重新注入海水，斑马贝一接触到盐水就会被消灭。
In the past a large amount of zebra mussels spread to North America by staying in the ballast water of a ship.
在过去，大量的斑马贝存活于船只的压舱水中并随船传播到北美。
n. 镇重物；配重块；稳定物
There was no extra ballast on the tractor.
拖拉机上没有额外的配重块。
Serious academic ballast has been added to the team by the recruitment of Ian Kennedy.
伊恩•肯尼迪的加盟为团队的学术力量增添了重要砝码。
vt. 使稳定；使有分量；为…配重
These new vehicles are accurately ballasted and stable.
这些新车配重精准而且平稳。
n. 道砟；道碴【铁路】
n. 镇流器【电子】
n. （混凝土粗集料）石碴【建】
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