空心金属门 meaning in English

hollow metal door
hollow-metal door

Glossary of terms for hollow metal doors and frames
空心金属门和门框的术语汇编
Specifications for commercial hollow metal doors and frames
商用空心金属门和框的规范
Guide specifications for stainless steel hollow metal doors and frames
不锈钢空心金属门和框架指导性规范
Guide specifications for detention security hollow metal doors and frames
阻滞安全型空心金属门和门框的指南规范
Guide specifications for swinging sound control hollow metal doors and frames
摇摆声控空心金属门及门框指导性规范