So why are the barriers to global mobility so high?

但为何全球流动性的障碍甚高？

Think of the sectors that rely on global mobility, like aerospace or travel and tourism.

想一想依赖全球流动性的行业，例如航空航天或旅行和旅游业。

Global mobility measures are still edging up, according to a recent report by JPMorgan Chase, a bank, suggesting continued growth in GDP.

根据摩根大通银行最近的一份报告，全球流动性指标仍在缓慢上升，这表明GDP仍在持续增长。