Several food plants, such as kola and okra, are known to have been domesticated in western Africa, but they are all supplemental, not staple, foods.
一些食用植物,如可乐和秋葵,已在西非培育,但它们都是补充性食物,而不是主食。
Fortunately, when indexing local documents (as the current version of indexer does), finding all of the documents is easy; they all live in known and enumerable locations.
幸运的是,当索引本地文档(正如目前版本的indexer这样)时,找到所有文档非常简单;这些文档都位于明确而可定位的地方。
Because the data are based on men with known fertility problems, it's not clear whether the results apply to all men as they age.
因为这些数据是以有已知生育问题的男性为基础而得出的,所以还不清楚它是否适用于同年龄的所有男性。
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