thickening rate

例句：

1. 1. The thickeningrate of the concrete is measured by itsweight gain per unit volume.
   混凝土的增厚率通过其单位体积的重量增加来测量。
2. 2. The rate of thickening in thesoil is affected by the amount of rainfall.
   土壤增厚的速度受到降雨量的影响。
3. 3. Thecompany's profitability has been increasingat a steady rate over the past year.
   该公司过去一年的利润增长稳定。