■ extro (outside)

Philip is an extrovert—he is outgoing, sociable and self-confident.
菲力普是個性外向的人──他外向、善交際而且有自信。

● vert (turn)

■   exo (outside)

As the practice of ethnic exogamy continues to expand, teachers and school officials in Taiwan must be prepared to communicate with parents in English, Vietnamese, Indonesian, and Thai.
隨著異族通婚的情況持續增多，在台灣學校的老師和職員皆須準備好跟家長用英文、越南文、印尼文和泰文溝通。

● gamy (marriage)

■ exo (outside)

Exotic species are often introduced through “prayer release,” a practice that can easily destroy the natural balance of an ecosystem.
異國的動物常藉佛教的「放生」而被引進，這樣的做法很可能會破壞生態系統的自然平衡。

● tic (relating to)

■ ecto (outside)

He was a specialist in developmental neurochemistry, with a special interest in the chemical signals in the embryo that cause the nervous system to develop from the ectoderm.
他是發展神經化學的專家，專門研究能使外胚層發展出神經系統之胚胎所發出的化學訊號。

● derm (skin)

以上內容出自：

 王復國 老師

 《理解核心字源》