米饭是不可数名词。说“一粒米”要用a grain of rice;“多粒米”要用grains of rice;“两碗米饭”要用two bowls of boiledrice。
As a rough guide, allow half a cup of rice per person.
大致定个标准，就是每人半杯米。
Leave the rice to cook for 20 minutes.
把大米煮20分钟。
The vegetables are stirred into the rice while it is hot.
趁米饭热时把蔬菜拌进去。
