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初中三年，我们都有一些难以忘怀的经历。学校英语俱乐部将组织题为“An Unforgettable Experience”的征文比赛。请根据提示，写一篇短文参赛。
1. What was the experience?
2. What have you learned from it?
注意事项：
（1）词数：100 词左右（文章开头已给出，不计入总词数）；
（2）文中不能出现真实姓名、校名等信息；
（3）文章必须包含所有要点，可适当发挥，使短文连贯、通顺。
An Unforgettable Experience
Looking back on the past three years, everyone had some unforgettable experiences.
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同类型试题
y = sin x， x∈R， y∈[–1，1]，周期为2π，函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x， x∈[–1，1]， y∈[–π/2，π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
y = sin x， x∈R， y∈[–1，1]，周期为2π，函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x， x∈[–1，1]， y∈[–π/2，π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
