词根：-tract-

【词根含义】：拉,引

【词根来源】：来源于拉丁语动词traho, trahere, traxi, tractus(拉)。

【同源单词】：abstract, abstraction, attract, attraction, attractive

前缀：sub-

【词根含义】：下,低;副;由下向上;后面

【词根来源】：来源于拉丁语sub。

【同源单词】：subaqua, subconscious, subdivide, subject, subjection

词根词缀：sub-, suc-, suf-, sug-, sum-, sup-, sur-, sus-, su-

【来源及含义】Latin: under, below, beneath; used as a prefix as shown in various formats below

【相关描述】The prefix sub- often becomes suc- before c: succumb.

The prefix sub- often becomes suf- before f: suffuse.

The prefix sub- often becomes sug- before g: suggest.

The prefix sub- often becomes sum- before m: sumptuous.

The prefix sub- often becomes sup- before p: suppression.

The prefix sub- often becomes sur- before r: surrogate.

The prefix, sub- is often simplified to su- before sp; as seen in suspect, suspend, suspicion, suspension, et al. Before c, p, and t; it is sometimes formed into sus-.

【同源单词】oversufficient, sub specie, sub voce, subabdominal, subaquatic, subaquatics

词根词缀：-tion

【来源及含义】Latin: a suffix forming nouns from verbs of condition and action; an act or process: resumption, absorption; state or condition, redemption, exhaustion; something resulting from or otherwise related to an act or process, assumption, friction

【相关描述】This unit is presenting a small fraction of the hundreds of words ending with the suffix of -tion; however, there is a significant number of words which may help everyone have a better understanding and appreciation of the use of this element.

【同源单词】abduction, abjection, ablution, ablution, abolition, abruption

词根词缀：tra-, tract-, trac-, -tractive, -traction, -tracting, treat-, trai-

【来源及含义】Latin: drag, draw together; a drawing out or pulling

【同源单词】abstract, abstract, abstracted, abstractedly, abstractedness, abstraction