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An engineer tests two floor-cleaning robots at one of Ecovacs Robotics' labs in Suzhou, Jiangsu province in April 2019. [Photo provided to chinadaily.com.cn]

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An appropriate default rate, other than an implicit guarantee, will help to develop a more healthy bond market as the investment instruments' prices will better reflect the different levels of credit risk. Thus, investors will know about the market's real situation, said Pan.

An investigation is still going on to confirm whether the collapse was caused by the modification work or due to the building's original structure, Zhang added.

An employee performs welding operations at a private company in Zibo, Shandong province. [Photo/Xinhua]