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The Dragon Boat Festival is a traditional Chinese festival. It’s in May or June. It’s in memory (纪念) of the great poet (诗人), Qu Yuan. On that day, people eat rice dumplings and race dragon boats. There are many different kinds of rice dumplings. Some have meat, some have nuts and some have ham (火腿) in them. All of them are nice. A dragon boat is like a dragon. It’s red, white, yellow and black. It’s 20 to 40 meters (米) long. In the race, people in the boats play the drum, wave (挥) the colourful flags and row the boats. All the people are happy.
1．The Dragon Boat Festival is a traditional festival.2．People eat dumplings at the Dragon Boat Festival.
3．Some rice dumplings have nuts in them.
4．A dragon boat is a dragon.
5．People race dragon boats at the Dragon Boat Festival.
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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
