Update README_zh.md

ShiLiang Zhang

2023-07-21 afcbdd2d84cf59beb534b12829c67d61d83e605c

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