water cement ratio

例句：

1. 1. The construction of the bridge required a precise water-cement ratio to ensure its strength.
   建造这座桥需要精确的水灰比来确保其强度。
2. 2.The engineer carefully measured the water-cement ratio before mixing the concrete.
   工程师在混合混凝土前仔细测量了水灰比。
3. 3.The water-cement ratio is critical in determining the durability and strength of the concrete.
   水灰比在决定混凝土的耐久性和强度方面起着关键作用。