贸易谈判进展缓慢的主要原因并不是贸易保护主义的日渐增加；而是因为进一步自由化导致的复杂权衡取舍无法再被非常庞大的潜在利益所抵消。
The main reason for slow progress in trade negotiations is not increasing protectionism; it is the fact that further liberalization entails complex trade-offs no longer offset by very large potential benefits.