一、船用四行程柴油機氣缸蓋裝設多項重要構件，試列出五項重要構件名稱並說明其功能。

四、請將下列輪機英文翻譯成中文：Theoretically, the two-stroke cycle engine, with one working or power strokeevery revolution, develops twice the power of a four-stroke engine of the sameswept volume. The four-stroke engine rotating at medium speed, usuallybetween 250 and 750 rev/min, is used for auxiliaries such as generators andsometimes for main propulsion with a gearbox.