This revealed the hidden motivation that, since giving blood involves a bit of pain, people will happily do it if it's considered charity, but not if it equates to a low-paying job.
这个研究结果揭示了其中隐藏的动因，虽然献血会有一些疼痛，但如果这是一种慈善行为，人们会乐意去做，然而如果把它变成一种低廉的金钱交易，那么他们就不会再觉得开心了。
Using spans here is probably a bit excessive; all the text within the title div will be hidden, as will all the text in the slogan div.
在这里使用span可能有点多余；所有在标题div内的文本将被隐藏，以及所有在标语div内的文本也一样。
Unparalleled worldly love, no turning back, it is hidden in every human heart the softest place, it was that bit by bit the love that constitute this family.
世间的爱无可比拟，义无反顾，它隐藏在每个人心中最柔软的地方，正是这点点滴滴的爱才构成了这个大家庭。
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