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"Economic momentum appears to have slowed in some major foreign economies, and that weakness could affect the US economy," Powell told the House Financial Services Committee in Washington in his semiannual monetary report to federal lawmakers. "Moreover, a number of government policy issues have yet to be resolved, including trade developments, the federal debt ceiling and Brexit."

"Efforts are needed from all parties, including the government, schools, medical institutions and especially students and their parents," he said.

"Don't hold the strings too tightly with your fingers. Gently drive your wrist with your forearm," Zhang explained to the beginners while beating time with her hands.

"Development with high emissions and pollution affects not only the long-term economic development, but also people's health. That is not the development we want," Wang Guoqing, spokesman for the first session of 13th National Committee of the Chinese People's Political Consultative Conference, said at a news conference.

"Even by today's standards, these are considered very good," Zhang says. "We will do our best to bring back their shape and color."