1
n. slag from [source]
常作不可数名词，指冶炼等过程中形成的熔渣或矿渣。
The slag from the furnace can be used to make cement.
炉子里产生的熔渣可以用来制造水泥。
熔渣；矿渣
先理解核心含义，再看它在真实句子里的用法。
熔渣；矿渣
the scum formed by oxidation at the surface of molten metals
The slag from the furnace can be used to make cement.
炉子里产生的熔渣可以用来制造水泥。
矿山废料
Waste material from a mine.
熔融金属表面氧化形成的浮渣
the scum formed by oxidation at the surface of molten metals
熔融金属表面形成的浮渣
Scum that forms on the surface of molten metal.
金属从矿石中冶炼时形成并分离出的杂质；玻璃化炉渣
Impurities formed and separated out when a metal is smelted from ore; vitrified cinders.
After the metal cooled, workers removed the slag from the surface of the furnace.
金属冷却后，工人们清除了炉子表面的熔渣。
The black slag was poured into molds and later used in road construction.
黑色的矿渣被倒入模具中，后来用于道路建设。
The welder knocked the slag off the weld before checking the joint.
焊工在检查焊缝前敲掉了焊点上的焊渣。
常作不可数名词，指冶炼等过程中形成的熔渣或矿渣。
The slag from the furnace can be used to make cement.
炉子里产生的熔渣可以用来制造水泥。
及物用法，主语常为高温、助熔剂等，宾语为被熔化的金属。
The intense heat slagged the metal.
高温使金属变成了熔渣。
不及物用法，主语通常是矿石或杂质，表示变成熔渣。
These impurities slag during smelting.
这些杂质在冶炼过程中变成熔渣。
Not this
The furnace produces many slags every day.
Use this
The furnace produces a lot of slag every day.
表达“熔渣、矿渣”时，slag 是不可数名词，不能用复数形式 slags，也不能与 many 连用；应改用 a lot of slag 或 much slag。
Not this
The workers are slaging the waste metal.
Use this
The workers are slagging the waste metal.
slag 是“辅音-元音-辅音”结尾的重读闭音节词，加 -ing、-ed 时须双写末尾的 g，所以是 slagging/slagged，而不是 slaging/slaged。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
高炉矿渣
Blast furnace slag can be recycled as a building material.
高炉矿渣可回收用作建筑材料。
熔融矿渣
Workers must be careful when handling molten slag.
工人在处理熔融矿渣时必须小心。
矿渣堆
The old slag heap remains visible from the village.
从村庄仍能看到那个旧矿渣堆。
矿渣棉
Slag wool is often used for thermal insulation.
矿渣棉常用于隔热。
矿渣水泥
This bridge was built with slag cement.
这座桥是用矿渣水泥建造的。
（背后）批评，贬损
She's always slagging off her colleagues behind their backs.
她总是在背后贬损同事。
Use slag naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
冶炼后浮在金属表面的渣叫 slag；读音像‘死拉格’，想象工人把黏稠的熔渣死死拉出来。
语域：formal 常见场景：metallurgy、welding、foundry “熔渣/矿渣”这一义项属于工业技术用语，通常出现在冶金、焊接、铸造等专业场景，日常口语中较少使用。
这些词均与 slag 押韵，重读元音及后面的音都是 /æɡ/，拼写也都以 -ag 结尾。注意形近但读音不同的词：slug /slʌɡ/（蛞蝓）、slap /slæp/（掌掴）、slog /slɒɡ/（苦干，英式）。
Dictionary facts from ECDICT, WIKTIONARY.