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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.

"COVID-19 cases are surging and we must take urgent action to flatten the curve now," tweeted Los Angeles mayor Eric Garcetti on Monday.

"China is endeavoring in pushing forward various types of innovation, and innovation is a key driving force of Airbus. We would like to take advantage of such a cooperation opportunity," he said.

"China and Pakistan will always support each other on issues involving each other's core interests, and safeguard common interests of the two countries as well as other developing countries," Xi said.

"China continued to invest in Brazil ... despite tough times (for) the Brazilian economy. Through the TCP, we are expecting stepped-up exchange, stepped-up shipments and stepped-up importing from China," he said.