质心

例句：

1. 1. The project's quality control is crucial to its success.
   该项目的质量控制对其成功至关重要。
2. 2. The company's financial stability is the key to its long-term growth.
   公司的财务稳定性是其长期增长的关键。
3. 3. The team's collaboration is the foundation of their success.
   团队的合作是他们成功的基础。