![](https://cos-cdn.shuashuati.com/pipixue-wap/2020-1230-1107-56/ti_inject-812ce.png)
In contrast with the tools lei and si, leisi has the following benefits:
A.
its handle was longer and at a proper length;
B.
its working part, that is the cutting edge, was sharper and more durable;
C.
the new tool made it possible for people to work with a standing position.
D.
the service life of the tool became much longer.