Although not obtain the knowledge's sufficient conditions, but JTB model can still be saved as a set of necessary conditions.

尽管没有解决“知识”的充分条件问题，但仍然可以将JTB模型作为必要条件保留下来。

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In addition to JTB series Roots blower, our company also produces and sales low-noise DT tank centrifugal fan, T35/BT35, T30 axial fans, CF more airfoil centrifugal fan and axle roof ventilator.

我公司除生产销售JTB系列罗茨风机外，同时还生产销售DT低噪声柜式离心风机、T35/BT35、T30轴流风机、CF多翼型离心通风机及DWT型轴流式屋顶通风机等。

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JTB, Japan's largest travel agency, said there had been no sudden cancellations.

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Like Japanese using their newly accepted JTB card who brought back bags of Kent cigarettes, Coach bags, Dunlop golf clubs and Rolex watches in the pioneer days of Japanese tourism to the U.S. in the early 1980s, the cachet for Chinese visitors of appearing wealthy and successful to family, friends, and work colleagues is definitely also a factor.

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