helium

helium

英 ['hiːlɪəm]
　　美 ['hilɪəm]

n. [化學] 氦（符號為He，2號元素）

中文詞源：

helium 氦，氦氣

來自希臘語helios,太陽。因這種元素發現於太陽光譜中而得名。

例句：

1. Helium is a very light gas.
氦是一種非常輕的氣體。

2. Helium is a gas used in balloons.
氦是一種用於氣球的氣體.

3. Unlike helium - 4, it cannot be produced by radioactive decay.
與氦 - 4不同之處是, 氦-3不能由放射性衰變產生.

4. The helium - 3 apparently became trapped when the earth was formed.
顯然,當地球形成時,氦 - 3就被圈閉瞭.

5. After hydrogen, the atom with the simplest structure is that of helium.
在氫元素之後, 氦的原子結構最簡單.