1. There''s not an atom of truth in what he said.
    他所说的没有一点是真话。

2. atom

2. He couldn''t produce an atom of evidence.
    他一点证据也拿不出。

1. atom：automatic transmission of mail; 邮件自动传输

1. 原子
    An atom is the smallest amount of a substance that can take part in a chemical reaction.

    e.g. A methane molecule is composed of one carbon atom attached to four hydrogens.
           甲烷分子由1个碳原子与4个氢原子构成。

1. (nontechnical usage) a tiny piece of anything

    Synonym: moleculeparticlecorpusclemotespeck

2. (physics and chemistry) the smallest component of an element having the chemical properties of the element