以下为句子列表：
英文: Backflow preventers must be installed in high-visibility locations in order to allow for immediate notice of telltale discharge or other malfunction.
中文: 防回流阀必须安装在清晰可见的位置，以便能够立即注意到排放报警或其他故障。
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英文: Backflow preventers should never be placed in pits unless absolutely necessary and then only when and as approved by local codes.
中文: 除非绝对必要并且得到当地规程的批准，否则防回流阀不能放置在坑内。
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英文: Backflow preventers should never be placed in pits unless absolutely necessary and then only when approved by local codes.
中文: 除非绝对必要并经过当地规程的批准，否则绝不应该将防回流阀放置在坑内。
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英文: Backflow prevention assemblies MUST be installed by a licensed journeyman tradesperson, who is recognized by the authority having jurisdiction, and inspected for compliance with local safety codes.
中文: 防回流阀总成必须由有资格证书的熟练技术人员安装，安装人员必须通过有关主管部门的认可，并符合当地安全规程的要求。
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英文: To avoid this discharge, install a spring-loaded check valve ahead of the backflow assembly to lock-inthe downstream pressure.
中文: 如果放置在坑内，则应该采取措施使得排放总是在地面上，或对于坑内排放，要确保在安全阀下方配置一个适当的气隙。
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