add comment for creat reoutesegment

[XuDaHaoRen]

No description provided.

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.

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[daohu527]

@XuDaHaoRen Thank you for your contribution. There are 2 points that need to be modified. Change the comments to English comments and format the PR commit. Thank you.