machine head的用法和樣例：
例句
- There is a bolster across the head of the bed.
床頭上有一個(gè)長(cháng)枕墊。 - The general was lying on the bed, his back against the headboard, hands clasped behind his head.
將軍躺在床上，背靠床頭板，頭枕在交疊的雙手上。 - Spindle feeds and speeds are controlled by selector levers which engage the proper gears in the drill head.
主軸的進(jìn)能量和轉速是通過(guò)選速桿使主軸箱中的適當齒輪相嚙合而控制的。
