Can someone explain to me how Zheng He's trips made a difference to Chinese trade?

https://www.google.com/search?source=hp&ei=iixoXaP5CoyStQWboYO4AQ&q=Zheng+He%27s+trips+&oq=Zheng+He%27s+trips+&gs_l=psy-ab.3...4715.4715..5537...0.0..0.156.269.0j2......0....2j1..gws-wiz.....6..0i308i154i357.plEqCy1U3vg&ved=0ahUKEwij5v2M7ajkAhUMSa0KHZvQABcQ4dUDCAc&uact=5