a substance used as a preparatory coat on previously unpainted wood, metal, or canvas, especially to prevent the absorption of subsequent layers of paint or the development of rust
底层涂料,底漆。
a cap or cylinder containing a compound which responds to friction or an electrical impulse and ignites the charge in a cartridge or explosive
火帽,底火;点火药。
a small pump for pumping fuel to prime an internal-combustion engine, especially in an aircraft
(尤指飞机内燃发动机的)启动注油泵。
【生化】 引物,引子。
an elementary textbook that serves as an introduction to a subject of study or is used for teaching children to read
识字课本,初级读本;入门书。
"late Middle English: from medieval Latin