Susu

例句：

1. 1.She was talking to her friends in a language that I didn't understand.
   她正在和她的朋友们用一种我听不懂的语言交谈。
2. 2.The children were playing with their toys in the park.
   孩子们在公园里和他们的小玩具玩耍。
3. 3.The teacher explained the problem to the students in detail.
   老师向学生们详细解释了这个问题。