ballast

名词 n. 动词 v.
中文释义
英 /ˈbæl.əst/    美 /ˈbæl.əst/

英文释义

名词 n.
  1. Heavy material that is placed in the hold of a ship (or in the gondola of a balloon), to provide stability. uncountable,usually
    — “Oh, for the-- how much did you waste on that little boondoggle?” “Well, it's not that so much as--” “Krieger.” “Well, I needed ballast, and what better to simulate bricks of cocaine than, you know, bricks of cocaine.”
  2. Anything that steadies emotion or the mind. figuratively,uncountable,usually
  3. Coarse gravel or similar material laid to form a bed for roads or railroads, or in making concrete; track ballast. uncountable,usually
  4. A material, such as aggregate or precast concrete pavers, which employs its mass and the force of gravity to hold single-ply roof membranes in place. uncountable,usually
  5. A material, such as aggregate or precast concrete pavers, which employs its mass and the force of gravity to hold single-ply roof membranes in place.; Loose stone or big gravel used to hold rails and tracks in place. uncountable,usually
  6. device used for stabilizing current in an electric circuit (e.g. in a tube lamp supply circuit) countable,usually
  7. That which gives, or helps to maintain, uprightness, steadiness, and security. figuratively,uncountable,usually
    — With 73 minutes gone Rafael Márquez came on to add ballast at the back, appearing in his fifth World Cup aged 39 and with alleged links to drug trafficking, which he denies, on hold for now. And so they sat deep with a thin green line of five defenders ranged across their own penalty area as the game became a Mexican stand-off, attack versus defence.
动词 v.
  1. To stabilize or load a ship with ballast. transitive
  2. To lay ballast on the bed of a railroad track. transitive
    — The task of a Railway Construction Company, R.E., is to lay and ballast the track; [...].
  3. To weigh down with a ballast. transitive
    — The noosance was […] that to make the umbrella effective he would have to carry abroad such weight to ballast it as would put the whole contraption out of action for carrying abroad at all.

词形变化

ballasts plural ballasts present,singular,third-person ballasting participle,present ballasted participle,past ballasted past

词汇关系

衍生词
autoballaster ballastage ballast car ballastless ballastmaster ballast resistor ballast tank ballast wagon deballast in ballast in ballast condition overballast success ballast unballast unballasted water ballast ballast up reballast reballasting

词源

词源 1
From Middle English bar (“bare”) + last (“load”).
词源 2
From Middle English bar (“bare”) + last (“load”).
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