master top的用法和样例：
例句
- Andy thought out a way of climbing to the top of the pole.
安迪想出了爬上杆顶的办法。 - Hence, a bed with big posts and a sheet hung over the top, afforded some protection.
因此出现了有大柱子的床，柱顶撑起一张单子，可以有些防护。 - In addition, it is also a perplexed engineering problem in designing the under-structural column of ACSR when considering the supporting stiffness to the top of the column.
另外，在设计波纹拱下部结构柱时，如何考虑波纹拱对柱顶支承刚度也是困扰工程界的一个问题。
