A businessman selects packing equipment during the China Import and Export Fair in Guangzhou, capital of south China's Guangdong Province, April 15, 2018. The fair, with more than 25,000 exhibiting companies from at home and abroad, opened here on Sunday. (Xinhua/Lu Hanxin)

A businessman selects electronic products during the China Import and Export Fair in Guangzhou, capital of south China's Guangdong Province, April 15, 2018. The fair, with more than 25,000 exhibiting companies from at home and abroad, opened here on Sunday. (Xinhua/Lu Hanxin)

A businessman selects car parts during the China Import and Export Fair in Guangzhou, capital of south China's Guangdong Province, April 15, 2018. The fair, with more than 25,000 exhibiting companies from at home and abroad, opened here on Sunday. (Xinhua/Lu Hanxin)

A businessman selects machines during the China Import and Export Fair in Guangzhou, capital of south China's Guangdong Province, April 15, 2018. The fair, with more than 25,000 exhibiting companies from at home and abroad, opened here on Sunday. (Xinhua/Lu Hanxin)

Photo taken on April 15, 2018 shows the exhibition hall of the China Import and Export Fair in Guangzhou, capital of south China's Guangdong Province. The fair, with more than 25,000 exhibiting companies from at home and abroad, opened here on Sunday. (Xinhua/Lu Hanxin)

Businessmen select fork lifts during the China Import and Export Fair in Guangzhou, capital of south China's Guangdong Province, April 15, 2018. The fair, with more than 25,000 exhibiting companies from at home and abroad, opened here on Sunday. (Xinhua/Lu Hanxin)

Businessmen select home appliances during the China Import and Export Fair in Guangzhou, capital of south China's Guangdong Province, April 15, 2018. The fair, with more than 25,000 exhibiting companies from at home and abroad, opened here on Sunday. (Xinhua/Liang Xu)

Businessmen select goods during the China Import and Export Fair in Guangzhou, capital of south China's Guangdong Province, April 15, 2018. The fair, with more than 25,000 exhibiting companies from at home and abroad, opened here on Sunday. (Xinhua/Liang Xu)

A businessman selects home appliances during the China Import and Export Fair in Guangzhou, capital of south China's Guangdong Province, April 15, 2018. The fair, with more than 25,000 exhibiting companies from at home and abroad, opened here on Sunday. (Xinhua/Liang Xu)

A businessman selects air conditioner during the China Import and Export Fair in Guangzhou, capital of south China's Guangdong Province, April 15, 2018. The fair, with more than 25,000 exhibiting companies from at home and abroad, opened here on Sunday. (Xinhua/Liang Xu)

A businessman negotiates during the China Import and Export Fair in Guangzhou, capital of south China's Guangdong Province, April 15, 2018. The fair, with more than 25,000 exhibiting companies from at home and abroad, opened here on Sunday. (Xinhua/Liang Xu)

Photo taken on April 15, 2018 shows the exhibition hall of the China Import and Export Fair in Guangzhou, capital of south China's Guangdong Province. The fair, with more than 25,000 exhibiting companies from at home and abroad, opened here on Sunday. (Xinhua/Liang Xu)