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"Singular policy will no longer work for all issues as China's connection with the outside world has been so complicated and various interests overlapped so profoundly," Ruan said.

However, the policy has also been blamed for generating a number of social problems.

This will not only be conducive to the Chinese and U.S. economies, but also the robust, sustainable and balanced growth of the world economy, Lew said, adding that the U.S. is willing to work with China to address global and regional challenges.

This is a major change of the decades-long family planning policy in the world's most populous country.

Li told a joint press briefing with visiting British Prime Minister David Cameron that both sides agreed to promote each other's companies to seek breakthroughs in high-speed railway and nuclear power cooperation.