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。

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.

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谁能不被两位主人公为寻求自由和成就梦想，结伴乘一叶木筏顺着温驯的河水壮游四方的抒情故事所虏获？

Who could fail to be captivated by this epic, lyric tale of two companions headed down a benevolent river on a raft, seeking freedom and fulfillment of their dreams?

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百事可乐的合作方Merisant公司及可口可乐的合作方 Cargill公司马上推出了PureVia和Truvia，加入了其他原料改善甜叶菊的口感。

Merisant, partnered with PepsiCo, and Cargill, with Coca-Cola, promptly introduced PureVia and Truvia, improving stevia’s taste with natural ingredients.

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