Adding the prefix for created forlorn, meaning to be lonely or sad.

加上前缀“for”就构成了“forlorn”，意为“孤独的”或“悲伤的”。

For example, ’Un is a very common prefix in the English language.’

例如，在英语语言中un是一个很常见的前缀。

Students could focus on prefixes that are used to give a word an opposite meaning.

学生很有可能会关注词语的前缀来获得相反的意思。

In metric units, which of these prefixes means " billion" ?

以下的公制位中，哪一个前缀表示" 十" ？

No, Neil, though it does have the same prefix – 'micro'.

不，尼尔，虽然它们有相同的前缀" 微" 。

Prefixes are letters we add to the beginning of a word.

前缀是我们添加到词开头的字母。

Adding a prefix to a word makes a new word with a new meaning.

词添加一个前缀就会造就一个具有新含义的新词。

So we create new words by adding prefixes and suffixes to the root word.

我们通过向词根添加前缀和后缀来创造新词。

They don't normally occur as words on their own. But occasionally they do.

这些前缀通常不会自己作一个词用，但确实偶尔也会。

Or he's very 'pro' something -- well they're prefixes which have suddenly become different words.

或者是他非常‘pro’...这些是可以使词突然变得不同的前缀。

These prefixes are in order of thousand, million, billion, and trillion with giga denoting billion.

上述前缀按顺序分别表示千、百万、十和万，其中giga表示十。

The prefix in can change the meaning of a word into its opposite.

前缀 in 可以把一个词的意思变成它的反义词。

On the other hand, adeno- means gland.

而腺癌一词中的adeno-前缀意指腺体。

IN- is a negative prefix that means no or not.

IN-是一个否定前缀，表示没有或没有。

But in- is also a common negating prefix, leading to the second interpretation.

但是in-也是一个常见的否定前缀，于是引出了第二种释义。

It's biathlon, so I hear the phrase prefix bi, which means two.

它是冬季两项，所以我听到前缀“bi”这个词，意思是两项。

This re- prefix means to do something again.

这个“re-”前缀表示再次做某。

But if it's UNI, it stands for one.

但如果前缀是UNI，它代表“一”。

And the whole God thing, that was just PR back in e e day.

还有神明什么的 只是个前缀而已。

So we have " usual" means ordinary, I put the prefix in, it means not ordinary.

我们有“寻常的”，意思是普通的，我把前缀放进去，就变成不寻常了。