noun

ballast

压舱物, 道碴, 镇流器

The ship took on ballast to improve stability.

船只装上压舱物以提高稳定性。

Gravel is used as ballast for railway tracks.

碎石被用作铁路轨道的道碴。

((as sth.)) 作为压舱物/道碴 Gravel is used as ballast for railway tracks.

同义词: weight, counterweight, stabilizer

源自中世纪低地德语,可能与意为“纯粹的负载”的“bare last”有关。

想象一个热气球(ball)在最后一刻(last)需要重物来保持稳定。

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