helium 英式发音['hiːlɪəm]美式发音['hilɪəm]
helium相关例句和用法
We have a helium nucleus and one electron..我们有一个氦核和一个电子。
helium英英释义
[化学] 氦(符号为He,2号元素)英释中释na gas that is lighter than air and is used to make balloons float. It is a chemical element :symbol He
helium短语
liquid helium,液氦;液态氦.短语