It’s good to mix things up — the shower is a new place to do it, and, unlike a hotel room, it’s free.
对于混合东西很有帮助--浴室是一个实现它的新地方，而且，不像酒店，这是免费的。
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We can define generic methods in one place and mix them into our Objects across multiple Class types while limiting access to sensitive methods on a per Object basis.