Update README.md

README.md

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-We opensource our **Aquila2** series, now including **Aquila2**, the base language models, namely **Aquila2-7B**, **Aquila2-34B** and **Aquila2-70B** , as well as **AquilaChat2**, the chat models, namely **AquilaChat2-7B**, **AquilaChat2-34B** and **AquilaChat2-70B**, as well as the long-text chat models, namely **AquilaChat2-7B-16k** and **AquilaChat2-34B-16k**
+We opensource our **Aquila2** series, now including **Aquila2**, the base language models, namely **Aquila2-7B**, **Aquila2-34B** and **Aquila2-70B-Expr** , as well as **AquilaChat2**, the chat models, namely **AquilaChat2-7B**, **AquilaChat2-34B** and **AquilaChat2-70B-Expr**, as well as the long-text chat models, namely **AquilaChat2-7B-16k** and **AquilaChat2-34B-16k**
 
 The additional details of the Aquila model will be presented in the official technical report. Please stay tuned for updates on official channels.