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Symmetric means having two halves that match each other perfectly, like a mirror image — if you folded it in the middle, both sides would line up exactly. It's used for shapes, faces, patterns, and buildings, and also in math and science for things that balance in a more abstract way. The more common everyday word is actually 'symmetrical' — 'symmetric' shows up a bit more in math, science, and technical writing.
對稱的
組成sym- (together, same) + metr (measure) + -ic. Literally 'measured the same' on both sides.
同家族的字
- symmetrythe noun — the quality of being balanced or matching
- symmetricalthe more everyday adjective form, same meaning
- asymmetricthe opposite — not matching on both sides
原始詞典資料3 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
symmetricadj/sɪˈmɛt.ɹɪk/
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Synonym of symmetrical
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mathematicssciencesset-theoryOf a relation R on a set S, such that xRy if and only if yRx for all members x and y of S (that is, if the relation holds between any element and a second, it also holds between the second and the first).
- "Is a sibling of" is a symmetric relation.
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computingcryptographyengineeringUsing the same key (or keys that are trivially related) for both encryption and decryption.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。