1) Filter
[英]['fɪltə(r)] [美]['fɪltɚ]

濾層,過濾層
2) Protective filter

保護濾層
4) ceramic filter

陶瓷濾器
5) Filter well

濾水井
6) Substratum
[英]['sʌbstrɑ:təm] [美]['sʌb'stretəm]

次層、基層
参考词条