求翻译：浇筑水下混凝土必须做好充分的准备工作，配置足够备用应急设备和材料，确保浇筑水下混凝土时间≯6小时，必要时在混凝土内掺入缓凝剂以确保工程质量。是什么意思？

Pouring underwater concrete must be fully prepared to work, the configuration is sufficient standby emergency equipment and materials to ensure that underwater concrete pouring time ≯ 6 hours, if necessary, mixed with the retarder in the concrete to ensure project quality.

Under water pouring concrete must be fully prepared to work with sufficient standby emergency equipment and materials to ensure that concrete pouring water under DEP time 6 hours and, if necessary, in the concrete mixing retarder works to ensure quality.

Constructs the submarine concrete to have to complete the full preparatory work, the disposition enough spare emergency apparatus and the material, guarantees the construction submarine concrete time ≯6 hour, when the necessity mixes in the retarder in the concrete to guarantee the project quality.

Pouring underwater concrete must make full preparation, adequate standby equipment and materials ensure pouring underwater concrete ≯ 6 hours, necessary in concrete mixed with retarder to ensure engineering quality.

Pouring underwater concrete must be fully prepared to work, the configuration is sufficient standby emergency equipment and materials to ensure that underwater concrete pouring time ≯ 6 hours, if necessary, mixed with the retarder in the concrete to ensure project quality.