She slapped it open with her hand and ran across the room to the four-posted bed.
她用手一把推开门，直跑到房间那头有四根柱子的床前。
2
The four books I keep at hand are user-friendly.
我手头保存的这四本是比较容易掌握的。
3
He had thought the piano was merely a retirement pastime for his mother, and had protested mildly when she mentioned that her goal was to be good enough one day to play four-hand with him.