1. The body''s annual intake of metallic iron is infinitesimal.
    人体对金属铁的年摄入量是微不足道的。

1. 无限小的,无穷小的：infinite 无限的,无穷的 | infinitesimal 无限小的,无穷小的 | infinity 无穷大,无限,无限距

2. 无限小;无穷小：infinitely many 无穷多 | infinitesimal 无限小;无穷小 | infinity 无限(大无穷(大)

1. 极微小的;微不足道的
    Something that is infinitesimal is extremely small.

    e.g. ...mineral substances present in infinitesimal amounts in the soil...
           土壤含有的极微量的矿物质
    e.g. There was an infinitesimal pause.
           其中有一个极短暂的停顿。

1. (mathematics) a variable that has zero as its limit

1. infinitely or immeasurably small

    e.g. two minute whiplike threads of protoplasm
           reduced to a microscopic scale

    Synonym: minute