Biv
牛免疫缺陷样病毒
🗣️ 情景例句
What was it about?
刚才谈什么？
In secondary school, children study mathmatic、phsicas and chemistry.
中学的小孩会读到数学、物理和化学。
During the journey, their boat began to sink.
途中，船开始下沉，