Interest rates could fall soon and be a stimulus to the US economy.利率可能很快就会降低, 从而刺激美国经济。

Through our nervous system we adapt ourselves to all external stimuli.我们通过神经系统使自己适应所有的外部刺激。

There is a constant input of stimuli via our senses.我们通过感官不断接收刺激。