By slow accumulation

• 日积月累

By slow accumulation的用法和样例：

例句

1. Skeletal muscle loss occurs with age in all mammals and probably results from a cumulative failure to repair damage caused by normal use.
   骨骼肌随年龄增加而衰退的现象，在所有的哺乳类动物身上都会发生，可能是肌肉正常使用时的损伤没有修复，日积月累的结果。