词根：-ess-, -sent-, -senc-

【词根含义】：存在

【词根来源】：原始印欧语的be动词es-派生的拉丁语be动词为esse。-sent-来源于拉丁语be动词esse的现在分词词干;-senc-来源于esse在拉丁语中派生的词干-sentia;-ess-来源于esse在拉丁语中派生的抽象名词essentia(存在)。

【同源单词】：essence, essential, essentially, absent, assent

前缀：ab-

【词根含义】：分离,脱离;相反;加强意义

【词根来源】：来源于拉丁语前缀ab-。

【同源单词】：abbreviate, abbreviation, abbreviator, abdicate, aberrance

词根词缀：a-, ab-, abs-

【来源及含义】Latin: prefix; from, away, away from

【相关描述】This prefix is normally used with elements of Latin and French origins (abs- usually joins elements beginning with c, q, or t).

The form ab- is regularly used before all vowels and h; and it becomes a- before the consonants m, p, and v. The prefix apo- has similar meanings.

This list is a very small sample of the multitudes of a-, ab-, abs- prefixes that are available in dictionaries and those in this unit are only meant to present a few examples.

【同源单词】abampere, abampere centimeter squared, abampere per square centimeter, abarticular, abarticulation, abbreviate

词根词缀：-ence, -ency

【来源及含义】Latin: a suffix that forms nouns; action, process, state, quality, or condition of

【同源单词】abhorrence, absence, abstinence, adherence, adolescence, affluence

词根词缀：esse, sent-, terest-

【来源及含义】Latin: to be

【同源单词】absence, Absens haeres non erit, absent, absente febre, absente reo, absentee