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Can you answer these questions?
1) What does Aunt Jennifer do and how old is she? My aunt Jennifer is an actress and She must be at least thirty-five years old.
2) What part does Jennifer often act on the stage? She often appears on the stage as a young girl.3) What does she think of being grown up? It must be terrible to be grown up
年龄的两种表示方法：
① 数字+years old，作表语
thirty-five years old 三十五岁
② 数字+-year-old，作定语
my four-year-old daughter
must + 动词原形 不得不, 必须；(对现在的)推测
She must be a model.
She is fifteen years old. 她五岁了
She must be fifteen years old.
她很可能五岁
She must be at most fifteen years old.
她最多十五岁
She must be at least fifteen years old.
她至少十五岁
at least 至少, 最少
If you can’t clean the car, you can at least help me to clean it.
at most 最多
