balanced double mechanical seal

例句：

1. 1.The new design is perfectly balanced to ensure stability.
   新设计完美平衡，确保稳定性。
2. 2.The team's performance was balanced with both offense and defense.
   团队的表现既包括进攻也包括防守。
3. 3. The balance of the scales has shifted in favor of the opposition.
   天平的平衡已经倾向于对方。