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I take the medicine three times a day. She helps her mother once a week. Mary’s father is a policeman. There are 50 students in my class. 2. 表示客觀真理,科學(xué)原理,自然現(xiàn)象,等客觀事實(shí)或格言,諺語等。 The sun rises in the east and sets in the west every day. The man who has never been to the Great Wall is not a real man. Tomorrow is Tue