rise of staircase tread

• 楼梯踏步板高

rise of staircase tread的用法和样例：

例句

1. The two strands of the double helix are linked by pairs of nucleic acids like the treads in a spiral staircase.
   这个双螺旋结构的两股之间是由成对的核酸联结的，它们就像螺旋式楼梯中的踏步板。