Update README_zh.md

zhifu gao

2023-07-21 93ad0b19c54f7dd4481379d7db93482bbb2d2991

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beam_size: 5
penalty: 0.0
maxlenratio: 0.0
minlenratio: 0.0
ctc_weight: 0.5
lm_weight: 0.7