2.Because they are tried of their own cooking ,they have decided to go to a restaurant-|||-for a change.-|||-A他们都很疲劳,所以决定到饭馆就餐。-|||-B)他们自己不愿意做饭了,所以决定到餐馆就餐。-|||-C)他们讨厌他们做的饭,所以决定到另一个餐馆就餐。-|||-D)他们讨厌自己做饭了,所以决定改变一下到餐馆就餐。

步骤 1：理解句子结构
句子的结构是“Because they are tired of their own cooking, they have decided to go to a restaurant for a change.”，其中“Because”引导原因状语从句，“they have decided to go to a restaurant for a change”是主句。
步骤 2：翻译原因状语从句
“Because they are tired of their own cooking”翻译为“因为他们厌倦了自己做饭”。
步骤 3：翻译主句
“they have decided to go to a restaurant for a change”翻译为“他们决定去餐馆换换口味”。
步骤 4：综合翻译
综合以上翻译，句子的完整翻译为“他们厌倦了自己做饭，所以决定去餐馆换换口味”。