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"Each experiment took a whole 24 hours, and we would adjust our experimental program constantly. It is a process of trial, feedback, and progress. One needs to keep concentrating hard during the 24-hour experiment, and I would ignore other staffs' conversation if they were not experiment-related."

"Democrats reject any effort to let the administration deport little children, and we reject all anti-immigrant and anti-family attacks from this President," House Speaker Nancy Pelosi said in a statement.

"Ecological conservation concerns the future of the mankind, and it's the common goal of all nations to build a green home," Xi said in a congratulatory letter to the forum.

"Explain to me the purpose behind the tariffs and the long-term view. What do you expect to get out of this? I don't know what the end game will be and the outcome for the US," he said.

"Donald Trump is the first president in my lifetime who does not try to unite the American people -- does not even pretend to try. Instead, he tries to divide us," said the revered Marine general, who resigned as the Pentagon chief in December 2018 in protest against Trump's Syria policy.