有一次,妈妈让我仔细观察农家菜园里的扁豆。秋日里的扁豆叶早已绿中带黄,倒是饱满的扁豆醒目得很。“奇怪,这些扁豆为什么大多长在扁豆藤的外面,不长在扁豆藤的下面呢?”妈妈的话引起了我的思考。我走近扁豆,发现长在藤外面的扁豆颗粒饱满,闪着好看的光泽;而长在藤下面的扁豆都是干瘪的,怎么会这样呢? Once, my mother asked me to carefully observe the lentils in the farmstead. Lentil leaves in autumn has been green with yellow, it touches full of bright beans very eye-catching. “Strangely, why do these lentils grow mostly outside lentils and not under lentils?” "My mother’s words caught my thinking. I approached the lentils and found that the lentils long outside the vines were full of particles and shone with good-looking luster; and the lentils, long under the rattan, were shriveled, how could this be?