Remember, the apostrophe is important for indicating the omission in the century, and the “s�?at the tip is often lowercase to signify the plural type of the ten years.美元中间价是 衡量一国货币价值的重要指标 ，具体指‌中国人民银行于每个工作日闭市后公布的银行间外汇市场美元等交易货币对人�