Prefixes are parts of a word that you can add to the front to make a new word. 'Pre-' is an example of a prefix. It means 'before'. You put the prefix before the rest of the word. For example: preview, prepare, pretest.
字首是一個字的前面部分且可以把它加在(其他)字的前面變成一個新的單字。 "pre" 是字首的一個例子。 它是 "之前" 的意思。 你可以把字首放在字的其他部分之前。 例如: preview, prepare, pretest。
Why should you study prefixes? Learning prefixes can help add to your vocabulary. First, it can help you guess the meaning of new words you are seeing for the first time. Second, knowing the prefix can help you remember words that you have already learned. Prefixes are especially useful for taking tests or when reading textbooks.
為什麼要研究字首呢? 學習字首可以幫助增加字彙。 第一，它可以輔助你猜出初次見到的單字的意義。 第二，了解自首可以幫助記憶已學過的單字。 字首在考試或閱讀課本時特別有用。
These pages give some of the most common prefixes, though there are many more that are not listed here. Most prefixes will have many words that are made from them, but only a few examples will be listed. Many examples will also show a similar word without the prefix or with a different prefix to help you better understand the meaning of the prefix.
這裡列出最常見的字首，雖然還有很多沒被列入。 大部分的字首會組成很多字，但是只有一些字會被舉出來當例子。 有許多例子也會列出沒有字首的相似字或由不同字首組成的字來幫助更了解 "字首" 的意義。
You need to be a little careful when learning new words with prefixes. Sometimes you think you are seeing one prefix when you see another. For example, you might think that diagram is made of 'di-' (two) and 'agram', but really it is 'dia-' (across) and 'gram'. Or you might think diatomic is made of 'dia-' (across) and 'tomic', but really it is 'di-' (two) and 'atomic'. A word might have no prefix at all, even though it looks like it has one. Some prefixes have more than one meaning, sometimes even opposite meanings.
藉由字首來學習新單字時必須小心。 有時候你會以為看到某一個字首但其實是另一個。 例如，你有可能會以為 diagram 是由 "di" (雙)和 "agram" 所組成但是它其實是 "dia" (跨越)和 "gram" 組合而成。或者你也許會以為 diatomic 是由 "dia" (跨越)和 "tomic" 所組成但實際上它是 "di" (雙)和 "atomic" (原子)。 一個字也許完全沒有字首，即使它看起來有。 有些字首有時會有兩個以上的意思，有時甚至會是相反的意義。
Overall, though, prefixes will help you learn vocabulary words faster, and better understand English. Click on a prefix, or browse alphabetically to start learning!
總而言之，字首能幫助單字學習更快且更了解英文。 按進任何一個字首或者依字母順序瀏覽來開始學習吧！
a | an | ab | ante | anti | auto | bi | cent | circum | co | com | con | contra | counter | de | dec | deci | di | dia | dis | ecto | endo | en | em | epi | equi | ex | exter | fore | giga | hetero | hex | homo | hyper | il | im | in | ir | infra | inter | intro | kilo | mal | mega | min | meta | micro | mill | mis | mono | multi | nano | non | oct | omni | over | para | per | peri | penta | poly | post | pre | prim | pro | psych | quad | quint | re | retro | semi | sept | sub | super | syn | tele | trans | tri | un | uni | with