正如作家张小娴所说：“真正的爱情，不只是心动，更是心安。”这句话道出了爱情的本质——它不仅是激情四射的悸动，更是彼此依靠www.yueliang-cn ...

The erosion threshold of sand-mud mixtures is investigated by analyzing the momentum balance of a sand particle or a mud parcel in the mixture bed surface, and a formula for the critical shear stress ...

正如作家张小娴所说：“真正的爱情，不只是心动，更是心安。”这句话道出了爱情的本质——它不仅是激情四射的悸动，更 ...