Underlying the whole trip, however, is a sharp dissonance between what is expected of Mr Obama in Asia and the very strict domestic limits on what the US president can offer.

• 然而，在整个亚洲之行背后，则是尖锐的不和谐音：亚洲对奥巴马此行所寄予的期望，和美国国内对这位美国总统所能给予的严格限制之间的冲突。