Update readme_zh.md

Yabin Li

2023-08-21 937f1a301e37e6563d55068caf5e4c291ed98e1f

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