This should only be calculated if the particle size distribution curve is reasonably straight between 10% and 90%, showing that the aerosol is log-normally distributed. Where a straight line is a good fit to the data, the calculation of GSD is performed by noting the particle size X at which the line crosses the 84.13% mark and the particle size Y at which the line crosses the 15.87% mark.是解释曲线图的，不明白准确意思，讲一下意思就行。the line crosses the 15.87% mark.这个怎么理解？
參考答案:应该只计算这颗粒大小分布曲线是否是合理地平直的在10%和90%之间， 表示，湿剂是分布的日志正常。 那里一条直线是好适合到数据， GSD的演算通过注意微粒大小执行线横渡84.13%标记和微粒大小Y线横渡15.87%标记的x。