say. I don't understand "第四,中国外汇储备增加,一定程度上促使了美元的贬值"。"包括日本和中国在内的最优选择,就是抛售一些美元,迫使美元升值"。In terms of pure guessing work of China's current problem, maybe try Lewisian turning point making more sense. At least it helps to explain the food price moving up in China.
The following one have a few points worth to think: