A rainbow made by a prism: white light spreads out into a smooth band that runs from red at one end through to violet at the other, with every shade in between and no gaps.
From the word’s history
From Latin spectrum 'an appearance, image', from specere 'to look at'. It names what appears to the eye when light is spread out — the visible band you can look at.
來自拉丁文 spectrum「顯現、影像」，源自 specere「觀看」。它指的正是光被攤開後「呈現在眼前、看得見」的那條帶子，所以核心一直扣著這條可見的色帶。
Online Etymology Dictionary, etymonline.com/word/spectrum
登入就可以看每一支怎麼連回核心畫面。
原始詞典資料10 筆記錄
以下是外部詞典記錄的用法，摘錄並精簡格式，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。
spectrumnoun/ˈspɛktɹəm/
- 1
A range; a continuous, infinite, one-dimensional set, possibly bounded by extremes.
- Near-synonyms: sliding scale, continuum
- As Mr. Obama prepared to take the oath, his approval rating touched a remarkable 70 percent in some polling — a reflection of good will across the political spectrum.
- 2
Specifically, a range of colours representing light (electromagnetic radiation) of contiguous frequencies; hence electromagnetic spectrum, visible spectrum, ultraviolet spectrum, etc.
- Current 3G technologies can send roughly 1 bit of data - a one or a zero - per second over each 1 Hz of spectrum that the operator owns.
- 3
educationhuman-sciencespsychologyThe autism spectrum.
- He punctuated his words with a look into my eyes that might have been read as threatening or menacing by anyone who was not on the spectrum. But I am on the spectrum, and so I stared back at him.
- 4
communicationselectrical-engineeringengineeringA set of frequencies that are used for radio-frequency communication; not necessarily a continuous range.
- 5
chemistrynatural-sciencesphysical-sciencesThe pattern of absorption or emission of radiation produced by a substance when subjected to energy (radiation, heat, electricity, etc.).
- 6
linear-algebramathematicssciencesThe set of eigenvalues of a matrix.
- 7
mathematicssciencesOf a bounded linear operator A, the set of scalar values λ such that the operator A—λI, where I denotes the identity operator, does not have a bounded inverse; intended as a generalisation of the linear algebra sense.
- 8
algebraic-geometrygeometrymathematicsAn abstract object in mathematics created from a commutative ring R and denoted operatorname Spec(R) or operatorname SpecR and said to be the spectrum of R; useful in the study of such rings for providing a geometric object which encodes many of the properties R, and in modern geometry for generalizing the notion of an algebraic variety to that of an affine scheme. Formally, the set of all prime ideals R equipped with the Zariski topology and augmented with a sheaf of rings called the structure sheaf, generated by the B-sheaf on the distinguished open sets D_f which assigns the localization of R at f to each set D_f, regarded as a ring of functions on D_f. See Spectrum of a ring on Wikipedia.Wikipedia
另外 2 個記錄的用法
- 9
obsoleteSpecter, apparition.
- 10
The image of something seen that persists after the eyes are closed.
摘錄自 英文維基詞典 English Wiktionary，已精簡格式；依 CC BY-SA 4.0 授權使用，改動後的內容同樣以此授權提供。