When President Trump and China’s leader, Xi Jinping, meet this month to talk about a fragile trade truce, one issue is sure to dominate: China’s seemingly unstoppable export engine. 特朗普总统与中国领导人习近平将于本月会晤，讨论脆弱的贸易休战问题。届时，中国看似不可阻挡的出口引擎势必将成为主要议题。 Chinese customs…