The Titanic, in the early 20th century, separated the different classes of travelers with metal gates.

20世纪初的“泰坦尼克号”用金属门把不同等级舱位的乘客隔开。

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This paper analyses the mechanism of corrosion and its prevention about metal gates, and expounds the application of thermal spraying in gates against erosion.

本文通过对金属闸门腐蚀机理和防腐机理的分析，阐述热喷涂工艺在水工闸门防腐中的应用。

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Olson's 40-acre Minnesota "laboratory" is tucked away down a cornfield-lined dirt road, through overgrown metal gates and past a green-roofed barn he rebuilt into his home.

奥尔森在明尼苏达州的40英亩“试验室”隐匿在成片玉米地里，那条土路两边玉米成行，要穿过好几个铁栅门，经过他在家重建的绿顶仓库才能到达。

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The metal gates that bar entry to the wards in the Cecilia Makiwane hospital are there to stop criminals stealing blankets and medicine.

BBC: Case Study: South Africa

Visitors have to pick their way carefully to reach the metal gates of his home, where power cuts are frequent and the water supply intermittent.

BBC: NEWS | Middle East | Disappointment reigns among Iraqis

Corrections officials were blunt in explaining their reason for finally inviting reporters, albeit without cameras, to peek behind the heavy metal gates for the first time since the penitentiary opened 13 years ago.

CNN: Reporters get first look inside mysterious Supermax prison