mix proportion of concrete

例句：

1. 1. The engineer determined the mix proportion ofthe concrete to ensure its strength and durability.
   工程师确定了混凝土的混合比例，以确保其强度和耐久性。
2. 2. The constructioncompany used this mix proportion to build thenew bridge.
   建筑公司使用了这个混合比例来建造新桥。
3. 3. The project manager carefullymonitored the mix proportion to ensure it metthe required standards.
   项目经理仔细监控了混合比例，以确保它符合所需标准。