休斯顿地铁系统已成功测试了呼吸安全系统，它使用紫外杀菌照射杀死某些类型的细菌，致死率高达99%。
The Houston Metro system has successfully tested the Breathe Safe system, which USES Ultraviolet Germicidal Irradiation to kill up to 99 percent of certain types of bacteria.
休斯顿地铁系统已成功测试了呼吸安全系统，它使用紫外杀菌照射杀死某些类型的细菌，致死率高达99%。
The Houston Metro system has successfully tested the Breathe Safe system, which USES Ultraviolet Germicidal Irradiation to kill up to 99 percent of certain types of bacteria.
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