seven
先理解核心含义，再看它在真实句子里的用法。
seven
There are 7 days in a week.
一周有7天。
用法提示：数字7表示数量，作数词使用。
She bought 7 apples at the market.
她在市场买了7个苹果。
用法提示：7作数词修饰名词，表示具体数量。
My little brother is 7 years old.
我弟弟7岁了。
用法提示：7与years old搭配，表示年龄。
seven是数字7；seventeen是17。词形相近，但seventeen表示‘十几’，且重音在后。使用前先确认数量级。
seven是7；seventy是70。词尾-ty表示整十，注意与基数词seven区分。
seven是基数词，表示数量7；seventh是序数词，表示顺序第七。若表示‘第七个’应用seventh。
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