ballast: [16] Originally, ballast appears to have meant literally ‘bare load’ – that is, a load carried by a ship simply for the sake of its weight, and without any commercial value. English probably acquired it, via Low German, from a Scandinavian language; Old Swedish and Old Danish had not only ballast but also barlast, which appears to betray the word’s component parts: bar, related to English bare, and last ‘burden’ (Old English had hlæst ‘burden’, related to lade, which survived into the 20th century as a measure of weight for various commodities). => bare, lade
ballast (n.)
"heavy material used to steady a ship," 1520s, from Middle English bar "bare" (see bare; in this case "mere") + last "a load, burden," or borrowed from identical terms in North Sea Germanic and Scandinavian (compare Old Danish barlast, 14c.). "Mere" because not carried for commercial purposes. Dutch balg-last "ballast," literally "belly-load," is a folk-etymology corruption.
中文解释
1. from Middle English bar "bare" (see bare; in this case "mere") + last "a load, burden".2. 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。
实用例句
1. We can trust that company; the partners are in ballast all right.
我们可以信任那家公司, 其合伙人都很可靠.
来自《简明英汉词典》
2. He has got no ballast whatever.
他这个人一点也不沉着.
来自《简明英汉词典》
3. Then the sound of rumbling thunder reached the watchers on the shore, as cargo, ballast, ammunition and 400 people went sliding and crashing down to the port side of the steeply listing ship.