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" 十亿" ？

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

不，尼尔，虽然它们有相同的前缀" 微" 。

As you can see, both words have the same prefix that means equal.

如你所见，这两个字都有 意味着「均等」的字首。

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.

给词添加一个前缀就会造就一个具有含义的词。

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词。

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千、百万、十亿和万亿，其中giga表十亿。

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。

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

IN-是一个否定前缀，表没有或没有。

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-”前缀表再次做某事。

The prefix of this word, kata, means “down.”

这字的字首意思是“下”。

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。

She uses the prefix hyper to say that there is too much of a certain quality.

她使用前缀“hyper”来表某种特质太多。

Ah yes – and the word 'micro' used as a prefix, indicates that something is small.

啊，是的。还有" 微" 这个词用作前缀，表某物是小的。