Sino-US economic and trade relations are the most powerful proof of the win-win and interdependent nature of bilateral relations. But the good momentum that has been achieved has also encountered some obstacles because some people in the US always want to politicize the relationship and Washington has been maintaining restrictions on high-tech exports to China. Now Obama has begun his second term and vowed to expand exports, it is high time for Washington to ease restrictions on high-tech exports to China, as this would provide a big boost to trade relations.