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Biden, 77, made the remarks as he accepted the Democratic presidential nomination on Thursday night, setting up an election battle with Republican President Donald Trump under the grim shadow of an unprecedented health and economic crisis.

Besides the seven manufacturers that have suspended production for more than three years, all of the other 38 manufacturers currently producing vaccines have relatively comprehensive quality control systems as required. Also, all the vaccines produced are up to standards, the statement said.

Biden said his conversations with the president were private.

Between rousing musical performances by many of the talented students, Fabiola Vilchez, president and executive director of SCOLA, told the assembled parents and their beaming kids, "We'd like to thank the parents for trusting us to take their kids to China. The opportunity was just incredible - life-changing - not just for the kids but for all of us."

Besides Ford-branded vehicles, Changan Ford are expected to produce Lincoln vehicles starting late this year.