top beam的用法和樣例：
例句
- At the top, both columns are connected by a strong, large connection piece which achieves a high transverse rigidity for the machine frame.
兩個立柱的頂部由一套堅固的大截面頂梁連接，為機床部件橫向運動提供了極高的剛性。 - Reporters on the scene saw that the man slept, at the top Liang Haizhuqiao reinforced from time to time make various moves grimace.
記者在現場看到，該男子蓬頭垢面，站在海珠橋下頂梁的鋼筋上不時做出各種動作鬼臉。
