concrete beams的用法和樣例：
例句
- The analytical results for strength and behavior of unbonded prestressed concrete beams were presented.
給出了無粘結預應力混凝土梁強度和受力性能的分析結果。 - They would certainly be less pleasing to the eye and often more expensive than the prestressed concrete beam.
與預應力混凝土梁比較，它們自然更顯得外貌粗拙，不甚美觀，而且成本也往往更高一些。
