1.Take, for instance, these precast concrete beams.

以这些预制混凝土梁为例。机翻

2.Bringing precast bridge segments to market will take a bit longer, as more rigorous certification is involved.

将预制桥梁部分推向市场需的时间，因为涉严格的认证。机翻

3.The result is a frame that acts as a skeleton for precast concrete sections which can then be assembled into a bridge.

结果是一个框架作为预制混凝土部分的骨架，然后可以组装成一座桥。

4.With precast products like pavers and blocks, you might shoot steam into the curing chamber to try to accelerate the curing process.

对于摊铺机和砌块等预制产品，您可以将蒸汽喷射到固化室中以尝试加速固化过程。机翻