`pinyin -p` output sometimes incorrect

[suntong]

• Ego version (or commit ref): v0.40.0
• Go version: go1.14.3
• Gcc version: gcc version 9.3.0
• Operating system and bit: 5.4.0-33-generic x86_64

Description

The output of pinyin -p sometimes are not correct.

Correct example:

$ pinyin -p 银行
2020/10/11 13:47:09 Load the gse dictionary: "/home/tong/l/ws/Go/pkg/mod/github.com/go-ego/gse@v0.50.3/data/dict/dictionary.txt" 
2020/10/11 13:47:12 Gse dictionary loaded finished.
yín xíng

Incorrect example:

$ pinyin -p 中国话
2020/10/11 13:46:54 Load the gse dictionary: "/home/tong/l/ws/Go/pkg/mod/github.com/go-ego/gse@v0.50.3/data/dict/dictionary.txt" 
2020/10/11 13:46:56 Gse dictionary loaded finished.
zhng gu huà

somehow the 韵母 of the first two letters are incorrect.

Please double-check. thx.