1 [U] [C] the seeds of wheat, rice, etc 谷物；谷类: The US is a major producer of grain. 美国是谷物的主要生产国。grain exports 谷物出口a few grains of rice 几粒米 ☞picture at cereal 见 cereal 插图

2 [C] a grain of sth a very small piece of sth 一粒的量: a grain of sand/salt/sugar 一粒沙╱盐╱糖 (figurative 比喻) There isn't a grain of truth in the rumour. 这传闻毫无真实性。

3 [U] the natural pattern of lines that can be seen or felt in wood, rock, stone, etc （木、石等可见或可触摸的）纹理