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Birch is grown in Northeast China. Strong and water-resistant, it is easily cut, bent or sewn, and has been a valuable building material since prehistoric times.

Boeing said on Tuesday that deliveries of 737 aircraft, the company's top-selling line, fell by about one third in the first quarter of 2019. However, the company did not break out deliveries of MAX aircraft and said other types of 737s are still being delivered to customers.

Birth totals over the past few years－since the 2016 adoption of the universal second-child policy, the latest policy relaxation in family planning－have shown the policy adjustment did not boost population growth effectively, and further relaxation is needed, said Lu Jiehua, a sociology professor at Peking University.

Boeing's decision to temporarily halt production of the 737 MAX jet may ripple through the US economy and could especially hurt 600 large and small subcontractors in the airplane manufacturer's supply chain.

Bolton reportedly received a 2-million-US-dollar advance for his tell-all book and if it sells well, additional royalties could follow.