1. 弯管, 肘管：angle bracket || 角撑架, 角铁托, 角形托座 | angle branch || 弯管, 肘管 | angle bulb || 球缘角材
2. 弯管：angle bracket ==> 角铁,角铁托架,角形撑铁,角形托座 | angle branch ==> 弯管 | angle brick ==> 角砖
3. 肋管：angle branch 弯管 | angle branch 肋管 | angle catch 窗插销
4. 肘管：angle braing 角铁撑 | angle branch 肘管 | angle brick 角砖