upper tweendeck

例句：

1. 1. The mountain is at its upper tweendeck.
   这座山处于它的最顶端。
2. 2. The scientist climbed to the upper tweendeck to observe the stars.
   这位科学家爬到了山顶来观察星星。
3. 3. The ship sailed towards the upper tweendeck.
   这艘船驶向了山顶。