英汉词典

1. 谷粒
    A grain of wheat, rice, or other cereal crop is a seed from it.

    e.g. ...a grain of wheat.
           一粒小麦
    e.g. ...rice grains.
           米粒

2. 谷物（尤指小麦或玉米）
    Grain is a cereal crop, especially wheat or corn, that has been harvested and is used for food or in trade.

    e.g. ...a bag of grain.
           一袋谷物
    e.g. ...the best grains.
           优质谷物

3. 细粒;微粒;小颗粒
    A grain of something such as sand or salt is a tiny hard piece of it.

    e.g. ...a grain of sand.
           一粒沙子