protective covering consisting, for example, of a layer of boards applied to the studs and joists of a building to strengthen it and serve as a foundation for a weatherproof exterior
a layer of decorative material (such as gold leaf or wood veneer) applied over a surface
Verb:
put something on top of something else;
"cover the meat with a lot of gravy"
kill by lying on;
"The sow overlay her piglets"
overlay的用法和樣例：
例句
用作動詞 (v.)
Psionic tattoos cannot overlay one another. 一幅靈紋不會覆蓋另一幅。
Overlay it with pure gold and make a gold molding around it. 要包上純金,四圍鑲上金牙邊。
I'm not very sure how to import a document or how to overlay a picture onto a text. 我不太清楚怎樣應用文檔，以及如何把一張圖片疊加在文本上去。
