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World Blood Donor Day (世界献血日) is a very important holiday. And its goal (目的) is to make people know about donating blood, encourage people to donate blood, as well as thank current (现在的) and past donors. It is held every year on June 14th.
The first World Blood Donor Day began in January, 2004. People chose June 14th because it was Karl Landsteiner’s birthday. Karl Landsteiner created the ABO blood group system (系统).
World Blood Donor Day is mainly a holiday of celebration. It encourages people to donate their blood worldwide. Blood is short in nearly all countries, especially in developing countries.
According to WHO, over 90 million people donate blood every year, but there is still a shortage (短缺) around the world. If everyone donates blood, there may not be such a shortage.
While World Blood Donor Day provides a chance to call to action, blood donors are also celebrated every June 14th. Some cities host events so that patients have the chance to thank donors for saving their lives. During these events, people may also be able to donate blood through blood donating centers.
Because of World Blood Day, more and more people get to realize the importance of donating blood. Not only is this important in achieving the goal set by WHO, but it is good for people.
1．What’s the goal of World Blood Donor Day?2．How long has it been since the first World Blood Donor Day began?
3．How many people donate blood every year according to WHO?
4．Is there a shortage of blood in developing countries?
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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
