系统专辑
系统精选文章共 4 篇，按时间顺序展示。以游客身份仅可体验第一篇，登录后可解锁全部内容。
apple, alligator, ant, book，bed，bat, cat，cap，cup
See the apple, the apple one the alligator, See the book, the book on the bed See the cat, the cat on the cap
dog, desk, duck elephant, egg, Eskimo fish, frog, flag
This is a dog, it is my dog, it is on the desk This is an egg, it is my egg, it is on the elephant This is a frog, it is my frog, it is on the flag