可以肯定的是，过去65年以来，贸易的快速增长在经济发展中扮演了至关重要的作用，使得发达经济体的各行业平均关税从超过30%暴跌到5%以下。
To be sure, for 65 years, rapid trade growth has played a vital role in economic development, with average advanced-economy industrial tariffs plummeting from more than 30% to below 5%.