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"The unattached lifestyle gives me more freedom. I don't need to work out complicated plans in advance and I can visit wherever I want," Zhang said.

Preparations are almost complete, and there have been several system tests ahead of the launch.

With the worsening effects of climate change, sustained population growth, industrialization and accelerated urbanization, water resources and water-related environmental and ecological problems are becoming more prominent, said Ma.

The reception was presided over by Premier Li Keqiang. Other senior leaders, including Zhang Dejiang, Yu Zhengsheng, Zhang Gaoli, Li Zhanshu, Wang Yang, Wang Huning, Zhao Leji and Han Zheng, also greeted the present 2,000 people.

About 400 people from the Philippines' ruling PDP-Laban (Democratic Party -- Power of the Nation) party and media groups attended Tuesday's symposium, including Aquilino Pimentel, party president and Senate president, and Pantaleon Alvarez, secretary general of the party and speaker of the House of Representatives.