名詞 ballast:

1. any heavy material used to stabilize a ship or airship
2. coarse gravel laid to form a bed for streets and railroads
3. an attribute that tends to give stability in character and morals; something that steadies the mind or feelings
4. a resistor inserted into a circuit to compensate for changes (as those arising from temperature fluctuations)
   同義詞：ballast resistor, barretter
5. an electrical device for starting and regulating fluorescent and discharge lamps
   同義詞：light ballast

動(dòng)詞 ballast:

1. make steady with a ballast

1. The readiness of a vessel for sailing with regard to ballast, sails, and yards.
   船的航行狀態(tài)從船的壓載、船帆和帆桁方面考慮看船的狀況是否能夠航行
2. He has got no ballast whatever.
   他這個(gè)人一點(diǎn)也不沉著。
3. Pig iron used as permanent ballast.
   壓載鐵做為永久性壓艙物的生鐵
4. The ballast placed in the ship can keep the ship steady.
   放在船上的壓艙物可以保持船的平穩(wěn)。

bal.last

n.（名詞）
Heavy material that is placed in the hold of a ship or the gondola of a balloon to enhance stability.
壓艙物，壓載：放在船艙或氣球吊籃里以增加穩(wěn)定性的重物

Coarse gravel or crushed rock laid to form a bed for roads or railroads.
道碴：用來鋪公路或鐵路路基的粗砂礫或碎石
The gravel ingredient of concrete.
石碴：組成混凝土的砂料
Something that gives stability, especially in character.
穩(wěn)定因素：表明穩(wěn)定性的因素，尤指在性格方面
v.tr.（及物動(dòng)詞）
bal.last.ed,bal.last.ing,bal.lasts
To stabilize or provide with ballast.
用壓載物來穩(wěn)定或支撐
To fill (a railroad bed) with or as if with ballast.
鋪沙石：用或似用沙石鋪（鐵路路基）

來源：
Perhaps from Old Swedish
可能源自 古瑞典語
or Old Danish barlast
或 古丹麥語 barlast
bar [mere, bare] * see bhoso-
bar [僅僅的，僅有的] *參見 bhoso-
last [load]
last [載重]