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Trade experts have also warned that Washington's additional tariffs on Chinese medical products may contribute to shortages and higher costs of vital equipment, thus impeding the U.S. response to the pandemic. But Washington has shown no signs of rethinking its doctrine of unilateral trade protectionism, and even threatened to impose more tariffs on China.

BEIJING, April 30 (Xinhua) -- Chinese President Xi Jinping on Thursday replied to a letter from the staff of a large private service company, extending greetings to them and other working people across the country ahead of the International Labor Day.

Support should be given to sales of export products in the domestic market. Measures will be taken to improve small and medium-sized firms' abilities to survive and thrive, including advancing tax and fee cuts and lowering financing and rental costs of the firms.

Shanghai has taken measures to promote the recovery of epidemic-hit culture and tourism, and exhibitions, cooking competitions and tours have been held online. Trip.com Group said its sales of travel products had reached 200 million yuan (28.33 million U.S. dollars) in seven recent livestreaming sessions as of Wednesday.