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Ptolemy was a/an [role]
用于介绍托勒密本人，role 可替换为天文学家、地理学家、数学家等身份。
Ptolemy was an Alexandrian astronomer of the 2nd century.
托勒密是公元2世纪亚历山大的天文学家。
托勒密（古希腊天文学家、地心说创立者）
ptolemies — plural of ptolemy
先理解核心含义，再看它在真实句子里的用法。
托勒密（古希腊天文学家、地心说创立者）
the 2nd-century Alexandrian astronomer who proposed the geocentric system
Ptolemy was an Alexandrian astronomer of the 2nd century.
托勒密是公元2世纪亚历山大的天文学家。
托勒密(公元2世纪的古希腊天文学家、地理学家、数学家；地心说的创立者)
n. Alexandrian astronomer (of the 2nd century) who proposed a geocentric system of astronomy that was undisputed until the late Renaissance；n. an ancient dynasty of Macedonian kings who ruled Egypt from 323 BC to 30 BC; founded by Ptolemy I and ended with Cleopatra
In ancient times, Ptolemy's model of the solar system was the standard explanation for the motion of the planets.
在古代，托勒密的太阳系模型是解释行星运动的标准学说。
Ptolemy wrote a major work that organized the astronomical knowledge of his era.
托勒密撰写了一部重要著作，系统整理了那个时代的天文学知识。
For over a thousand years, many scholars followed Ptolemy and accepted his idea of a geocentric universe.
一千多年来，许多学者追随托勒密，接受了他关于地心宇宙的观点。
用于介绍托勒密本人，role 可替换为天文学家、地理学家、数学家等身份。
Ptolemy was an Alexandrian astronomer of the 2nd century.
托勒密是公元2世纪亚历山大的天文学家。
所有格结构，常与地心说、天文学理论等名词搭配。
Ptolemy's geocentric system remained undisputed until the late Renaissance.
托勒密的地心说体系直到文艺复兴晚期之前都未受到质疑。
复数形式指托勒密王朝的历代国王，作主语时谓语动词用复数。
The Ptolemies ruled Egypt for nearly three centuries.
托勒密王朝统治埃及近三个世纪。
Not this
The Ptolemy system placed Earth at the center of the universe.
Use this
The Ptolemaic system placed Earth at the center of the universe.
Ptolemy 是名词（人名），不能直接修饰 system；表示“托勒密的/托勒密体系的”要用形容词 Ptolemaic。地心说的固定说法是 Ptolemaic system，而不是 Ptolemy system。
Not this
The Ptolemy ruled Egypt after Alexander the Great.
Use this
The Ptolemies ruled Egypt after Alexander the Great.
Ptolemy 单数只指某一位托勒密（如王朝创立者 Ptolemy I）；表示托勒密王朝历代君主或整个家族时，要用复数 the Ptolemies。英语中家族或朝代名常用姓氏的复数形式，如 the Ptolemies。
Not this
ptolemy was a famous astronomer in ancient Alexandria.
Use this
Ptolemy was a famous astronomer in ancient Alexandria.
Ptolemy 是人名，属于专有名词，在句中任何位置首字母都必须大写。中文没有大小写之分，所以学习者容易误写成全小写。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
托勒密的地心说模型
Ptolemy's geocentric model placed the Earth at the center of the universe.
托勒密的地心说模型把地球置于宇宙的中心。
托勒密一世
Ptolemy I founded the dynasty that ruled Egypt for nearly three centuries.
托勒密一世建立了统治埃及近三个世纪的王朝。
托勒密王朝
The Ptolemy dynasty came to an end with Cleopatra.
托勒密王朝随着克利奥帕特拉走向终结。
托勒密的《天文学大成》
Ptolemy's Almagest was the standard astronomical text for over a thousand years.
托勒密的《天文学大成》在一千多年里一直是标准的天文学著作。
托勒密王朝诸王
The Ptolemies promoted Greek culture throughout Egypt.
托勒密王朝诸王在埃及推广希腊文化。
Use ptolemies naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
把P当哑巴，读“Tolemy”像“托勒密”；他主张地心说，曾让地球稳坐宇宙中心千余年。
语域：neutral 常见场景：天文学史、古埃及史、科学史著作 Ptolemy 为专有名词，通常首字母大写；既可指古希腊天文学家托勒密，也可指古埃及托勒密王朝。两种含义均属中性书面语，多用于历史、科学史等正式语境。
专有名词，需大写；复数形式 Ptolemies 指托勒密王朝的成员或同名人物。
Dictionary facts from ECDICT.