No modification is required to the drawbooks function, because the objects all have the same keys and values as the original hash tables.

不需要对drawbooks函数做任何修改，因为对象都有与原始的散列表相同的键和值。

youdao

Keys can be set with dates for beginning and ending operations, so lost or stolen keys will no longer function.

钥匙可以被设置使用的有效期，因此丢失或被盗的钥匙就不能再使用了。

youdao

The keyboard is the one we uncovered last week, with no function keys, but a full row of Apple Keyboard-style actions.

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