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But prices of other metals like copper, aluminum and lead are expected to be unsteady in the second half, said Zhan.

But a locked chain-link fence blocked access to the site and the nearby White House visitor's center and its bathrooms were closed, with a hand-scrawled sign directing visitors to portable toilets, which also were chained shut. "Kind of annoying when you've got young children," Forcherio said.

But from a business angle, he sees the commercial aviation sector's future in making air travel more efficient and profitable.

But Jiang, who has spent more than 20 years in Shandong, Henan and Zhejiang; and abroad in the United States, Spain and Israel, doing research on salt- and alkaline-tolerant seeds was not fazed by the hostility.

But last month, North Carolina Governor Roy Cooper signed a bill to protect any college that does not refund students' housing costs and dining fees.