Our product has been using the persistence mechanisms described above for several years and they served us well.
我们的产品使用前面描述的持久性机制已有数年，它们工作得很好。
Schneider maintains that it has been using the technology in the disputed circuit breakers since the early 1990s, before Chint's patent applications in 1999.
施耐德坚称，自上世纪90年代初以来就一直在应用存在争议的断路器中的技术，而正泰是在1999年申请的专利。
China has a technological lead in turning coal into gas. It has been using the technology widely to make petrochemicals and fertilizers as a substitute for pricier natural gas.
中国在煤气化领域拥有技术领先优势，已在石化及化肥生产领域用到了这一技术，用以替代更为昂贵的天然气。
China has a technological lead in turning coal into gas. It has been using the technology widely to make petrochemicals and fertilizers as a substitute for pricier natural gas.
中国在煤气化领域拥有技术领先优势，已在石化及化肥生产领域用到了这一技术，用以替代更为昂贵的天然气。
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