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
(be/go) against the grain to be different from what is usual or natural 违反常情