Historically, however, the United States has from time to time experienced a strong impulse toward economic protectionism -- the practice of using tariffs or quotas to limit imports of foreign goods in the interest of protecting native industry.

• 在美国历史上常常出现一股强大的力量，向着保护主义方向发展，也就是利用关税或限额来限制外国商品的进口，以保护本国的民族工业。