词根：-jac-, -ject-, -jact-

【词根含义】：投,射

【词根来源】：来源于拉丁语动词jacio, jacere, jaci, jactus(投,射)。

【同源单词】：abject, adjective, conjecture, deject, dejected

前缀：il-, in-, ir-, im-

【词根含义】：不,无,非;入,向内

【词根来源】：(il-用于l前;im-用于b, m, p前;ir-用于r前;in-用于其它情况)   来源于拉丁语in。

【同源单词】：illegal, illegality, illegitimate, illiterate, illogical

词根词缀：in-2

【来源及含义】Latin: in, into, within, inside, on, toward [il-, ir-, im-], in, into, etc.: include, incur, invade; also, used intensively, as in the words inflame and inflammable, or without perceptible force.

【相关描述】The in- changes or is assimilated to il- before l, as with "illuminate", to im- before b, as with "imbibe"; before m, as with "immediate"; before p, as with "implant"; and to ir- before r, as with "irrigate".

The form generally remains unassimilated in words formed in English; such as, inbreed.

Don't confuse this in-², meaning "in, into, within", etc. with the Latin prefix in-¹ meaning "not" nor with the prefix for English-origin words in-³ meaning "in, into; within".

【同源单词】illuminate, imbibe, immigrate, import, inaugurate, incalescent

词根词缀：jet-, -ject, -jecting, -jected, -jection, -jector, -jectory; jacu-, jac-

【来源及含义】Latin: throw, send, fling, hurl, cast; gush; spurt

【同源单词】abject, abjection, abjectly, abjectness, adjectival, adjectival