One flat layer settles, then another settles on top of it, and then another, until what you are looking at is a stack of bands. The band at the bottom got there first. Wherever something is built up in layers like that, this word fits: rock, soil, air, tissue, the plants in a forest, even the levels of a society.
From the word’s history
Latin stratum meant something spread out, such as a cover laid on a bed. It is the neuter form of stratus, from sternere, to spread. Spreading one cover over another gives the same picture as one layer resting on another.
拉丁文 strātum 的意思是「鋪開來的東西」，本來指鋪在床上的墊子，來自 sternō（鋪、攤開）。鋪好一張、再鋪一張，正好就是一層疊一層的畫面。英文的 street（鋪出來的路）是同一個來源長出的另一條路。
Wiktionary, "stratum"
登入就可以看每一支怎麼連回核心畫面。
原始詞典資料8 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。
stratumnoun/ˈstɹɑː.təm/
- 1
One of several parallel horizontal layers of material arranged one on top of another.
- It is built of alternate strata of brick and clay, and the sides correspond to the direction of the meridians and parallels.
- He describes the operation thus: "The heavy ram employed to impart the finishing strokes, hoisted up with double purchase and snail's pace to the summit of the Piling Engine, and then falling down like a thunderbolt on the head of the devoted timber, driving it perhaps a single half inch in to the stratum below, is well calculated to put to the test the virtue of patience, while it illustrates the old adage of—slow and sure."
- 2
geographygeologynatural-sciencesA layer of sedimentary rock having approximately the same composition throughout.
- An illuminating article in a recent issue of the Eastern Region's Civil Engineering News points out that where coal is worked over a reasonably large area, it is not only the whole of the strata above the workings, but also an area beyond which is liable to subside at varying rates after the coal has been removed.
- 3
Any of the regions of the atmosphere, such as the stratosphere, that occur as layers.
- 4
biologynatural-sciencesA layer of tissue.
- 5
A class of society composed of people with similar social, cultural, or economic status.
- 6
biologyecologynatural-sciencesA layer of vegetation, usually of similar height.
- 7
computingengineeringmathematicsThe level of accuracy of a computer's clock, relative to others on the network.
- Computers that synchronize themselves to the stratum 1 time servers are known as stratum 2 time servers if they allow others to synchronize to them, and so on.
- 8
human-scienceslinguisticssciencesA historical layer of a language.
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。