overlay

n. 覆盖图；覆盖物

vt. 在表面上铺一薄层，镀

中文词源

overlay 覆盖

over-,在上，lay,放置。引申词义覆盖。

overlay (v.): "to cover the surface of (something)," c. 1300, in part from Old English oferlecgan "to place over," also "to overburden," and in part from over- + lay (v.). There also was an overlie in Middle English, but it merged into this word. Similar compounds are found in other Germanic languages, such as Gothic ufarlagjan. Related: Overlaid; overlaying.
overlay (n.): in the printing sense, 1824, from overlay (v.). Meaning "transparent sheet over a map, chart, etc." is from 1938. In earliest noun use it meant "a necktie" (1725).

1. over- "above" + lay "放置，铺设，覆盖，涂抹，涂覆".

3. There can be an emotional overlay to the frustration of solving real problems.: 在真正的问题难以解决而感到沮丧的时候，可能会用其他情感来掩饰。

4. In parallel or concordant bedding the strata overlay each other like pages of a book.: 在平行的或者整合的层面中,地层好象书页一般互相重迭.

5. In 1969 a ( 51 mm ) bituminous concrete overlay was placed on the concrete deck.: 1969年在混凝土板上铺设了51mm厚的沥青混凝土铺装层.