Excitability is the quality of becoming excited too easily — how quickly a person, an animal, or even a nerve in the body jumps to a strong feeling or a strong reaction.

Excitability易興奮、興奮性 is the quality of becoming excited too easily指的是太容易變得興奮的那種特質——how quickly a person, an animal, or even a nerve in the body一個人、一隻動物、甚至身體裡的一條神經有多快 jumps to a strong feeling or a strong reaction跳到強烈的感覺或強烈的反應。

If a child has high excitability, a small surprise can make them shout, laugh, or get upset. In everyday talk it often describes personality, and it can sound a little critical, as if the person cannot stay steady.

If a child has high excitability如果一個小孩興奮性很高，a small surprise一個小小的驚喜 can make them shout, laugh, or get upset就能讓他大叫、大笑，或難過起來。In everyday talk在日常對話裡 it它 often describes personality常常是在形容個性，and it而且 can sound a little critical可能聽起來有點批評的意味，as if the person cannot stay steady好像這個人沒辦法保持穩定。

Though actually, doctors and scientists also use it in a cooler way: the excitability of a muscle or a nerve means how readily it fires.

Though actually不過事實上，doctors and scientists醫生和科學家 also use it in a cooler way也會用比較冷靜、科學的方式用這個詞：the excitability of a muscle or a nerve一條肌肉或神經的興奮性 means how readily it fires指的是它有多容易被激發。

The related adjective is excitable. It names a tendency, not one burst of excitement.

The related adjective相關的形容詞 is excitable是 excitable（易興奮的）。It它 names a tendency指的是一種傾向，not one burst of excitement而不是一次的興奮爆發。