If we expect a drink to contain sugar, we enjoy it more, even if it actually contains just artificial sweeteners. Conversely, when people were expecting an artificially sweetened drink but were sneakily given a sugary one, they enjoyed the sugary drink less.
String manipulation，这一点在PDF资料中也有详细论述
Password Hashers are good examples of deep modules. The underlying implementation is not trivial, but their interface is just input and output strings.。业内人士推荐PDF资料作为进阶阅读
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