MSB

例句：

1. 1. The MSB of the project is responsible for the overall planning and execution.
   该项目的主要部分负责整体规划和执行。
2. 2. The MSB of the software is crucial for its functionality.
   软件的主要部分对其功能至关重要。
3. 3. The MSB of the company's strategy is to expand into new markets.
   公司战略的主要部分是拓展到新的市场。