- 1
A megaton measures how powerful an explosion is. One megaton means the blast is as strong as one million tons of TNT, a very strong explosive. You hear it in news, history, and science talk about nuclear bombs, not when you buy fruit. The ton here is a unit of blast, not a truck-load of stuff, though the idea started from that kind of weight. Though actually everyday English also borrows the word as slang — a megaton of homework — just to mean a huge amount, which is loose and not the scientific unit. In careful talk, keep it for weapons and disaster scale.
百萬噸（TNT當量）
組成mega- + ton. mega- is the scientific prefix for a million, from Ancient Greek μέγας (mégas, great). ton is the heavy unit of weight, here used for the blast of a million tons of TNT.
原始詞典資料4 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
megatonnoun/ˈmɛɡəˌtʌn/
- 1
A measure of the strength of an explosion or a bomb based on how many million tons of TNT would be needed to produce the same energy. (A derived unit for TNT equivalent.)
- Holonyms: gigaton < teraton < petaton < exaton (rare) < zettaton (rare) < yottaton (rare)
- Meronyms: ton of TNT < kiloton
- 2
One million tons.
- 3
One million tons.
- 4
One million tons.
- Holonym: gigaton
- Meronym: kiloton
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。