initial main sequence star

例句：

1. 1.The initial stages of the project were challenging.
   项目的初始阶段很有挑战性。
2. 2. The initial plan was to build a new bridge.
   最初的计划是建造一座新桥。
3. 3. The initial response from the government was positive.
   政府最初的反应是积极的。
4. 1.The main purpose of the meeting was to discuss the budget.
   会议的主要目的是讨论预算。
5. 2. The main focus of the research was on the effects of pollution.
   研究的重点是污染的影响。
6. 3. The main attraction of the festival is its vibrant cultural events.
   节日的主要吸引力是其丰富多彩的文化活动。