master top的用法和樣例：
例句
- Andy thought out a way of climbing to the top of the pole.
安迪想出了爬上桿頂的辦法。 - Hence, a bed with big posts and a sheet hung over the top, afforded some protection.
因此出現了有大柱子的床，柱頂撐起一張單子，可以有些防護。 - 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，在設計波紋拱下部結構柱時，如何考慮波紋拱對柱頂支承剛度也是困擾工程界的一個問題。
