full of beans 的用法在美国十分流行。
吃了一肚子豆子,天知道会怎么样!
一种说法是:科学家们认为,豆类含丰富维生素,对人的健康十分有益。
人们经常吃豆类当然可以"精力旺盛,神采飞扬"喽!
你看,The children were full of beans when they were told the picnic would be held the next Friday.
当孩子们得知下周五要野餐时个个兴高采烈。
所以,full of beans 为精神饱满,兴高采烈的意思。