Question

一个英语句子的解释-------务必高手帮忙

（1）Several weeks ago, our headmaster, Mr. Gaudi, told usthat our school had been chosen to compete on Smart Aleck—a game show which my best friend C arla and I both love. Carla has a good imagination, and I know a lot of history, so we thought we’d be good choice for the team.
（2）A few days later, Mr. Gaudi held a meeting with everyone interested in the show. He told us that Smart Aleck uses a five member team. He also said that three more people would be needed as backup（替补）. Unluckily four times that many students were at the meeting. So Mr. Gaudi said we would have a competition and the top eight scorers would become the team and the back up. Everybody agreed that this was a fair way to decide.
（3）Yesterday, all of the hopefuls went to the dining hall after school. 【We would have to decide the starting line-up（阵容）.】Mr. Gaudi acted as the host. After a couple of hours, all the places on the team were set except one. Carla and I tied for that last position. We had to hold a one-on-one competition between the two of us. The winner would be on the team and the loser would be the backup.
（4）Midway through our two-person competition, I was starting to pull ahead. Then I saw the look on Carla’s face. I waited for a second and knew what I had to do. As much as I wanted to be on Smart Aleck, Carla wanted it even more. So, starting with my next question, I held back and le t Carla win, just by a little bit. Her expression as she realized she would be on the show made up for my not being on the team. And since I will go as backup, I’ll still have the fun o f seeing the show up close.
（5）Was I cheating by not trying as hard as I could? I don’t think so. No one noticed, and Carla and I didn’t plan it. It won't hurt the team because Carla will be a very good competitor on the real show. I think that making my best friend happy was the right thing to do.

只翻译第（3）段，请标准翻译，谢谢请解释【】里的一句话，我们不得不决定开始阵容。我是不懂“汉语”意思，什么叫“决定开始阵容”，不懂。不知道你们能否给我解释。

Answer 1

昨天，所有预选人员都在放学后到食堂集合，【我们需要确定出赛阵容】，高迪先生做主持人。几个小时后，队伍中只剩一个角色待定了。而我需要跟卡拉进行一对一比赛，获胜者入队，另一人候补。
括号里的话并不难理解，出赛阵容 指的就是出赛的队员是哪些人。

Answer 2

decide不仅是决定的意思，在句中可以翻译为讨论 【我们应该得讨论下阵容。】

Answer 3

首发阵容，就是谁先上场，谁当替补

Answer 4

我们将不得不决定首发阵容 额。。好吧- -
刚看见下面有了- -

Answer 5

我们将不得不决定首发阵容（阵容）。