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Democrats have accused Trump of pressuring Ukrainian President Volodymyr Zelenskiy in a July 25 phone call to investigate Biden and his son Hunter, who served on the board of Ukrainian energy company Burisma.

Despite measures from hiring more couriers to deploying smart warehouses, courier service providers still face the challenge of ensuring on-time delivery. However, what the environment is confronted with is much more serious.

Demand for China-Europe freight trains has shown strong momentum as the country's economy has gradually recovered from the fallout of the COVID-19 epidemic.

Despite the difference, the two sides left room for further discussions, with Trump highlighting the economic benefits for the DPRK if it gave up its nuclear weapons.

Democrats said they had enough material to move forward with public impeachment hearings even though some Trump administration officials have refused to cooperate.