1. 卧床：four-part 四部 | four-poster 卧床 | four-pounder 大炮

2. 四柱大型卧床：four-handedfoursome 四人做的 | four-poster 四柱大型卧床 | four-pounder 发射四磅重炮弹的大炮

3. 四柱大床：four pole generator == 四极直流发电机 | four poster == 四柱大床 | four potential == 四元电位

4. 四柱床：linoleum 油布 油毡 | four-poster 四柱床 | convertible 敞篷车

noun

1. a bed with posts at the four corners that can be used to support a canopy or curtains