双轨制僵化，带有歧视性。
在伊朗核问题上，中方坚持“双轨”战略，始终认为对话与谈判是解决伊朗核问题的最佳途径。
China stays committed to the "dual-track strategy" and believes that negotiations and dialogues are the best solutions to the Iranian nuclear issue.
这座桥不仅拥有四个行车道，还有一个双轨铁路。
Not only is the bridge equipped to handle four lanes of traffic; it also has a double-track railway.
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