Breather valve and flame arrestor are indispensable safety devices.
可見呼吸閥、阻火器是儲罐不要缺少的安全設(shè)施.
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So the railroad will buy the spark arrestor.
所以鐵路將購買阻火器.
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The railroad will realize that it can save this $ 100 cost by investing $ 50 in a spark arrestor.
鐵路將意識到,它可以通過投資50美元購買阻火器來省下這100美元.
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