In the summer of 1997, at the age of fifteen, I learned a valuable life lesson.
1997年的夏天，在我15岁的时候，我学到了人生的重要一课。
Jack took a lesson from his colleague, Mark, and showed up to work fifteen minutes early each day.
杰克从同事马克身上得到了教训，之后每天提早十五分钟上班。
My daughter recited the fifteen conversations in lesson 94 there.
我女儿在那里背诵了第九十四课的十五个对话。
My daughter recited the fifteen conversations in lesson 94 there.
我女儿在那里背诵了第九十四课的十五个对话。
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