Given that some kids eat peanut butter almost every day, this seems like a simple and practical switch.
每天给孩子们吃花生酱，就像个简单易行的转变。
The above principles have been successfully used for designing a practical switch matrix NS161, which has been running satisfactorily in Shanghai Astronautics Bureau.
上述概念已成功地用于开关阵列NS161的设计中，目前这个开关阵列正服役于上海航天局。
Because the String class is immutable, and highly specified and controlled, it was practical to bring it into the fold of switch - but it was prudent to stop there.
因为string类是不变的，并且是高度具体化和受控的，所以将它放入switch中很实用，但最好不要止步于此。
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