mounted spare

基本解释

The extra large exterior side mirrors are a necessity as the spare wheel is mounted on the rear tail gate, reducing the view rearwards when using the rear view mirror.
特大型外墙的侧后视镜是一种必要的备用轮胎被安装在车尾尾门，减少认为后面当使用后视镜。
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The spare 780-pound coolant pump, built by Boeing, is mounted on an external platform just in front of the station's airlock module, relatively close to the faulty pump module.
备用冷却剂泵由波音公司制造，重 780磅，刚好安装在空间站气闸舱前部的一个外工作面上，相对接近于故障泵模组。