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"By hammering on each wooden railroad tie, workers can tell how much it has eroded and when to replace them with new ones," Dong said, adding a routine check of the ties is arranged once a month.

"China now is our No. 2 market for international tourism, we also share world heritage cultural distinctions," Kenney said, adding that this January, representatives from the Philadelphia department of commerce visited China and discussed more opportunities for collaboration.

"But pandas having black eye circles turn white is not caused by this disease," Luo said.

"China Everbright Group is a central State-owned enterprise. It is our duty to participate in the 'three tough battles' against major risks, poverty and pollution."

"China is evolving, and we are becoming better and smarter in the country. We inject talent and resources here, rooting in China and growing with Chinese partners," Lien said.