overlay mat

例句：

1. 1. The engineer designed the overlay mat to protect the structure from damage during construction.
   工程师设计了覆盖层来保护结构在施工期间免受损坏。
2. 2.The new overlay mat is more durable than the old one, making it ideal for heavy use.
   新的覆盖层比旧的更耐用，非常适合重使用。
3. 3.The overlay mat was installed carefully to ensure a smooth transition between the two layers.
   覆盖层被仔细安装，以确保两层之间的平滑过渡。