事实上，美国的净对外投资负债最近又有所增长 — — 到2016年9月底达到了7.8 万亿美元，主要原因是美国持续的经常项目赤字和汇率效应导致的净负债扩大。
In fact, the US’s net liabilities have grown lately – to $7.8 trillion at the end of September 2016 – owing largely to its continuing current-account deficit and stronger exchange-rate effects.