At the time, coca leaf extract mixed with wine was a common tonic, and Pemberton's sweet brew was a way to get around local laws prohibiting the sale of alcohol.
当时，古柯叶提取物混合酒是一个常见的滋补品，潘伯顿的甜酒则是一种可以绕过当地禁止售酒的法律的方法。
Scientists think this is the plants' way to prevent the spread of any tree diseases and make life more difficult for leaf-eating insects like caterpillars.
科学家认为，这是植物防止树木疾病传播的方法，并给像毛毛虫之类的食叶昆虫制造些生存上的困难。
In an HDBMS like the one illustrated above, the only way to discover this would be an extremely costly search of every book leaf node.
在上面举例说明的HDBMS中，找到答案的唯一方法是搜索每个书籍叶节点，而这样做的成本极其高。
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