The trade surplus in China may last for a period as China's advantage of low production cost still exists.
So there must be trade surplus in the processing trade.
Everyone knows that during the 1970s the Japanese yen traded at 380 yen to the dollar and then appreciated to 110 yen per dollar. But Japan has all along enjoyed a trade surplus with the United States and their surplus went from US$10 billion at the time to over US$80 billion.