In most countries,people usually eat traditional food on special holidays.A special day in the United States is Thanksgiving.It is always on the fourth Thursday in November,and is a time to give thanks for food in the autumn.At this time,people also remember the first travelers from England who came to live in American about 400 years ago.These travelers had a long,hard winter,and many of them died.In the next autumn,they gave thanks for life and food in their new home.These days,most Americans still celebrate this idea of giving thanks by having a big meal at home with their family.The main dish of this meal is almost slways turkey,a large bird. 这个短文里面的语法、句型、短语……就是一系列的知识……我明天要上台讲的,求大神帮忙 要详细一点 每个知识点