A stimulus is something that encourages activity in people or things.
例句
Interest rates could fall soon and be a stimulus to the US economy...利率可能很快就會(huì)下調(diào)，從而刺激美國經(jīng)濟(jì)。It is through our nervous system that we adapt ourselves to our environment and to all external stimuli.我們是通過神經(jīng)系統(tǒng)使自己適應(yīng)環(huán)境及所有外部刺激的。
英漢詞典釋義
n.
刺激物; 激勵(lì)物; 促進(jìn)因素
Light is a stimulus to growth in plants.光是促進(jìn)植物生長的一個(gè)因素。
英英詞典釋義
Noun
1. any stimulating information or event; acts to arouse action