foreign customer can also buy BitCNY with BTS in the wallet's inner-market then fund your BTC38 CNY balance with BitCNY to trade all kinds of crypto products at BTC38 with better liquidity from the CNY trading pairs .
of course you can also buy BitCNY from someone willing to sell it to you
But at this point you can't with BitCNY or BitUSD from BTC38 directly .