说到为什么要与他人合作，我有三个理由：第一，在忙碌的、现代化的社会中，

说到为什么要与他人合作，我有三个理由：第一，在忙碌的、现代化的社会中，想要有效地完成一项工作，我们必须学会与人合作，第二这样可以节省时间和精力，第三还可以从合作者身上学到很多。

結果 (英文) 1:

When it comes to why cooperation with others, I have three reasons: First, you want to complete a busy, modern society, we must learn to cooperate with people, and the second so you can save time and effort, third from collaborators who learned a lot.

結果 (英文) 2:

When it comes to why to cooperate with others, I have three reasons: first, in a busy, modern society, want to complete our work effectively and efficiently, we must learn to cooperate with others, second can save time and energy, third also can learn a lot from partners.

結果 (英文) 3:

Talk about why you want to work with others, I have three reasons: first, in a busy, modern society, wants to effectively complete a task, we must learn to cooperate with others, second this can save time and effort, third from partners who also can learn a lot.