substratum
substratum — 名詞
- substratumsingular
- substrataplural
1. A natural layer of rock or earth that lies underneath the topsoil or surface lay
底岩；底土
位於表土下的岩石或泥土層
A natural layer of rock or earth that lies underneath the topsoil or surface layer of an area.
Dario's team drilled through the topsoil to examine the rocky substratum beneath the construction site.
Dario 的團隊鑽過表土，檢查建築工地下方的岩質底層。
collocation: rocky substratum / clay substratum
Heavy rain caused the clay substratum to absorb too much water, weakening the hillside.
暴雨導致黏土底層吸收了過多水分，削弱了山坡的穩定性。
The geologist took samples from the sandy substratum and found traces of ancient marine fossils.
地質學家從砂質底層中採集樣本，發現了古代海洋化石的痕跡。
Nila explained how the granite substratum under the city affects the design of tall buildings.
Nila 解釋了城市下方的花崗岩底層如何影響高層建築的設計。
- bedrock
more concrete; refers specifically to solid rock beneath soil, not loose material like clay or sand
- subsoil
refers to the layer of soil just below the topsoil, not necessarily rock
- underlayer
more general and less technical; any layer beneath another
- topsoil
the uppermost layer of soil that sits above the substratum
用法筆記
The standard plural is substrata. This sense is most common in geology and earth-science writing.
常見錯誤
2. A layer of material placed or found underneath another layer in a man-made struc
底層；墊層
在另一層下方的材料層
A layer of material placed or found underneath another layer in a man-made structure or surface.
The workers spread a substratum of crushed stone before laying the concrete pathway.
工人們鋪設了一層碎石墊層，然後才澆築混凝土步道。
collocation: substratum of crushed stone / gravel
A foam substratum beneath the carpet helps reduce noise between apartment floors.
地毯下方的泡棉墊層有助於減少公寓樓層之間的噪音。
Eli checked that the waterproof membrane substratum was correctly installed under the bathroom tiles.
Eli 確認防水膜的底層已正確安裝在浴室磁磚下方。
Karim noticed the wooden substratum behind the old painting was beginning to rot from dampness.
Karim 注意到那幅舊畫背後的木質底層因潮濕而開始腐朽。
- underlay
specifically a layer placed under flooring or carpet; less formal than substratum
- base
more general term for the bottom layer of a structure
- underlayer
neutral and descriptive; any layer beneath the visible surface
- surface layer
the topmost visible layer of a structure
用法筆記
Distinguish from sense 1 — this sense extends to human-made materials (foam, gravel, membrane, wood) rather than natural rock and soil. The standard plural is substrata.
常見錯誤
3. A set of basic ideas, values, or conditions that form the hidden foundation from
根基；潛因
事物發展的重要基礎
A set of basic ideas, values, or conditions that form the hidden foundation from which something grows or develops.
Trust between the two communities is the substratum on which lasting peace must be built.
兩個社群之間的信任，是持久和平必須建立在上的根基。
pattern: is the substratum on which [something] is built
Beneath Haruto's calm expression lay a substratum of anxiety about his upcoming exams.
在 Haruto 冷靜的表情之下，隱藏著一層對即將到來考試的焦慮。
collocation: substratum of anxiety / sadness / fear
The professor argued that mutual respect forms the substratum of any healthy working relationship.
教授主張，互相尊重是任何良好工作關係的根基。
Iris sensed a quiet substratum of sadness in her grandmother's stories about the old days.
Iris 感覺到祖母講述往事時，話語中帶有一股淡淡的哀傷。
- foundation
more common and less formal; suggests a visible starting point rather than a hidden layer
- bedrock
more emphatic; suggests unshakeable solidity and permanence
- underpinning
more technical; focuses on structural or logical support
- basis
most general term; the starting point or main ingredient of something
- surface
the visible, obvious aspect as opposed to the hidden substratum
用法筆記
Almost always singular. The noun or phrase after of names an abstract quality (anxiety, trust, respect, sadness) or set of conditions, never a physical material.