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。
On the surface things may look promising, but if you can hang around a bit and do some homework, you'll find that there are surprising hidden benefits and all you've got to do is uncover them.
表面上看事情可能非常有前景，但如果你能到处逛逛、多多思考，你会发现令人惊喜的隐秘的利益，而你所做的那些事情仅仅是发现了它们。
But the important bit here is that the inner architecture of the application is hidden and only a stable, simple interface is exposed to the master application.
但在此重要的一点就是，应用程序的内部构造是隐藏的，而仅稳定且简单的接口才会暴露给主应用程序。
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