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But only seven species have survived - leatherbacks, greens, loggerheads, hawksbills, olive ridleys, kemp's ridleys and flatbacks - as human activities such as the illegal trading of turtle meat, eggs and shells, habitat destruction, marine debris and global warming have threatened the turtles' survival.

But a string of Chinese players including Huawei, Oppo and Xiaomi Corp, had said earlier this week they planned to attend the event as scheduled with better safety measures. Now they all have to rewrite their plans.

But investors also pointed out that Chinese cities still need to tackle a series of challenges before they become global cities, including IPR protection, environmental protection, further opening-up and continuous innovation, as well as self promotion.

But Zhen Robotics is convinced the costs will come down over time.

But Yang Zhen, professor at Beijing University of Chinese Medicine, said the removal from the directory only has limited influence on students at these universities.