Update readme_cn.md

zhifu gao

2023-08-08 d865a499c6e0fa608a089bf03e0c473d81e2c445

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