The dollar shortage created depreciation pressures on the CNY, which the PBoC declined to offset. The CNY was thus bound to fall, which it did last September.
美元短缺造成了CNY市场的贬值压力，而人民银行拒绝对此有所反应。于是，CNY不可避免地要出现贬值，这就是去年9月的情形。