我国城市轨道交通与国外相比，仍存在较大差距。
Yet the greater disparity still exists when, comparing the Urban Railway Traffic mode of our country with abroad one.
与国外相比，国产行波管在寿命和可靠性方面存在明显差距。
The gap of TWT between home and abroad mainly embodies in life and reliability.
但与国外相比，尤其在新产品开发、专用设备研制方面，还相对落后。
But with overseas compares, especially in new product development, special purpose equipment development aspect, but also relatively backward.
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