英语词汇speculum metal怎么读，是什么意思，单词翻译、读音、固定搭配用法和短语词组及例句-英汉双解词典

　

单词	speculum metal
释义	speculum metal noun[U] uk /ˈspek.jə.ləm ˌmet.əl/us /ˈspek.jə.ləm ˌmet̬.əl/ amixtureofcopperandtinthat was used in the past to makemirrors: （旧时制镜用的）铜锡合金，镜青铜 Mirrors made of speculummetalmay have also beenproducedinChinaandIndia.中国和印度可能也生产过用镜青铜做成的镜子。 More examples Mirrors of speculummetalwere hard toproduceand were onlyownedby thewealthy. Speculummetalis analloyof around two-thirdscopperand one-thirdtin. Asmallportionof speculummetal, whenanalysed,yieldediron. Speculummetalandbrasscannot besolderedtogether by theordinarymethods. SMART Vocabulary: related words and phrases Chemistry: metals & metalworking alloy anti-tarnish bar magnet base metal beaten bimetallic brazen brazier bullion ferrous galvanized gild gold leaf magnet manganese silver plate steelworker vermeil wrought iron zirconium See more results » (Definition ofspeculum metalfrom theCambridge Advanced Learner's Dictionary & Thesaurus© Cambridge University Press) Examplesofspeculum metal speculum metal Speculummetalwas very hard to cast and shape. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. He chose an alloy (speculummetal) of tin and copper as the most suitable material for his objective mirror. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. For nearly 200 yearsspeculummetalwas the only mirror substance that could perform this task. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. After much experiment, he chose an alloy (speculummetal) of tin and copper as the most suitable material for his objective mirror. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. He started building his own reflecting telescopes and would spend up to 16 hours a day grinding and polishing thespeculummetalprimary mirrors. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Glass was also more thermally stable thanspeculummetal, allowing it to hold its shape better through temperature changes. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The poor optical quality of the early polishedspeculummetalmirrors meant that telescopic sights were not practical. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. All of these larger reflectors suffered from the poor reflectivity and fast tarnishing nature of theirspeculummetalmirrors. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This saved on the severe light loss the image would suffer if he had used aspeculummetaldiagonal mirror. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Mirrors ofspeculummetalor any precious metal were hard to produce and were only owned by the wealthy. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The material their primary mirror was made of wasspeculummetal, a substance that only reflected up to 66 percent of the light that hit it and tarnished in months. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Sincespeculummetalmirror secondaries or diagonal mirrors greatly reduced the light that reached the eyepiece, several reflecting telescope designers tried to do away with them. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. #https://dictionary.cambridge.org//dictionary/english/speculum-metal##
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更新时间：2025/1/18 20:26:07