A FOT index is an index that is similar to a B-Tree index, but an FOT index has multiple root nodes and fewer levels. (B-Tree indexes have only one root node and more levels.)

FOT索引类似B - Tree索引，但它有多个根节点和较少的级(B - Tree索引只有一个根节点和更多的级)。

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The cost of a hepatitis B shot to prevent liver cancer has plunged 68% over a similar period, allowing millions of kids to be vaccinated.

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The non-profit I used to work for eventually offered a similar plan, a 403(b), with the same benefits, but other employees might not be so lucky.

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Hepatitis B is a similar liver disease that can range from a mild illness to a serious, chronic condition.

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