top beam的用法和样例：
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.
两个立柱的顶部由一套坚固的大截面顶梁连接，为机床部件横向运动提供了极高的刚性。 - Reporters on the scene saw that the man slept, at the top Liang Haizhuqiao reinforced from time to time make various moves grimace.
记者在现场看到，该男子蓬头垢面，站在海珠桥下顶梁的钢筋上不时做出各种动作鬼脸。
