helium是什麼意思 helium的用法 helium怎麼讀

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helium

英 ['hiːlɪəm]美 ['hilɪəm]

n. [化學] 氦（符號爲He，2號元素）

使用頻率:★

星級詞彙:★

記憶方法

1. hel- / heli- "sun" + -ium.
2. 因爲該元素最初是在日食期間從太陽光譜中探測出來的，因此就取了這個名字，-ium 本是用於金屬元素的後綴，由於該元素最初被認爲是一種鹼金屬，所以就使用了這個後綴。

中文詞源

helium 氦，氦氣

來自希臘語helios,太陽。因這種元素髮現於太陽光譜中而得名。

英語詞源

helium (n.)

1868, coined from Greek helios

"sun" (see sol), because the element was detected in the solar spectrum during the eclipse of Aug. 18, 1868, by English astronomer Sir Joseph N. Lockyer (1836-1920) and English chemist Sir Edward Frankland (1825-1899). It was not actually obtained until 1895; it was assumed before that to be an alkali metal, hence the ending in -ium.

權威例句

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.

來自英漢非文學 - 科技

4. The helium - 3 apparently became trapped when the earth was formed.

顯然,當地球形成時,氦 - 3就被圈閉了.

來自英漢非文學 - 科技

5. After hydrogen, the atom with the simplest structure is that of helium.