The plumbing contractor I just mentioned established a series of systems to make good on its guarantee, including equipping employees with handheld vacuums, booties and belted uniforms.
我在上面所提到过的那位承包商建立了一系列担保实施制度，包括员工培训、奖励和统一制服。
To ensure proper operation, this valve must be installed by a qualified service technician or licensed plumbing contractor in accordance with these instructions and local plumbing codes and standards.
为确保设备安装正确性，本安全阀安装须由有资格证书的管道承包商或维修技术人员按照说明书及其他相应规定进行。
DO not attempt to conduct an inspection on your own. Contact your plumbing contractor for a reinspection to assure continuing safety.
不要试图自己进行检查。请与您的管道承包商联系，让起来检查以确保使用安全。
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