There shall be no brass or bronze parts used within the check assembly or relief valve.
在止回阀总成和安全阀内部应该没有黄铜或青铜部件。
When I was in college, I liked playing it and could even change a paper into a bronze relief.
大学时我就常玩的一招, 甚至能将卡纸做成青铜浮雕的!
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