1. They serve as food for animals, and pollinate plants. 它们为动物提供食物，还能为植物授粉。
2. They convert units of heat into useable engineering units that serve as input signals for process controllers and recorders. 他们将热量单位转换成可用的工程单位，作为过程控制器和记录器的输入信号。
3. They serve as a separation layer to form a stable boundary between layers of soil to maintain the integrity, character and performance properties of each layer. 土工织物相当于一个隔离层，在不同的土层之间形成稳定边界，以保持每层的完整性、固有特性以及使用性能。
网络释义
serve as 作为，用作;
充当;
起作用;
用作;
serve as a lookout 观风;
to serve as 起....的作用,被用作,充当;
起....的作用，被用作，充当;
用作、充当;
服务于;
