《魏书·列传·卷二十三》
借给他水道，但敌人不可放纵，应当先发兵在黄河上游阻截，不让西去。 
假其水道，寇不可纵。宜先发军断河上流，勿令西过。 
Lend him the waterway, but the enemy cannot be indulged. We should send troops to intercept in the upstream of the Yellow River and prevent him from going west.
<s>[INST] Take each pair of old and new sentences and unite them into a single translation that captures the core meaning: Archaic: 假其水道，寇不可纵。宜先发军断河上流，勿令西过。  Updated: 借给他水道，但敌人不可放纵，应当先发兵在黄河上游阻截，不让西去。  [/INST] Lend him the waterway, but the enemy cannot be indulged. We should send troops to intercept in the upstream of the Yellow River and prevent him from going west.</s>
Take each pair of old and new sentences and unite them into a single translation that captures the core meaning: Archaic: 假其水道，寇不可纵。宜先发军断河上流，勿令西过。  Updated: 借给他水道，但敌人不可放纵，应当先发兵在黄河上游阻截，不让西去。
user
Lend him the waterway, but the enemy cannot be indulged. We should send troops to intercept in the upstream of the Yellow River and prevent him from going west.
assistant