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An online spreadsheet maintained by Bryan Alexander, a senior scholar at Georgetown University, recorded 215 school closures as of Thursday afternoon.

Analysts said the rise is attributable to seasonal and other factors and it is still too early to predict a full rebound in manufacturing activity.

And 36 percent of the top sellers were from China by June last year, compared to 15 percent two years ago.

An unmanned aerial vehicle carrying cargo is seen during a test flight in Guangzhou, the capital of Guangdong province. DHL-Sinotrans and Chinese drone company Ehang jointly launched a fully automated and intelligent drone-based delivery solution in China on Thursday. [Photo provided to chinadaily.com.cn]

And Cranfield University and Harbin Engineering University will explore potential synergies in the installation and operation of different off shore energy facilities, with the aim of lowering overall costs.