來源于希臘語，意為"around,on all sides",其變形為circ,circu。此外，與circum意思相近的前綴還有ambi,peri. circum-原來是個(gè)拉丁介詞或副詞，意思相當(dāng)于around或about。作為一個(gè)介（副）詞性質(zhì)的原生詞綴，它一般附在拉丁動(dòng)詞詞干前，構(gòu)成原生動(dòng)詞或相應(yīng)的名詞與形容詞。在現(xiàn)代英語中，它也可以充當(dāng)派生詞綴，加在拉丁借詞前，構(gòu)成的往往是科技用詞。 1.circlet n.round band of gold or flowers worm as an ornament on the head,neck or arm,ring 環(huán)形飾物；戒指 *cire(=around) 例句：After the exhibition,several circlets were found to be missing from the royal jewels.展覽結(jié)束以后，皇宮珠寶中的幾個(gè)環(huán)形飾物不見了。 2.circuit n.circular journey,detour;closed path for an electrical current 周游，巡回；電路，線路 *circ(=around),it (=go) 例句：Two switches had to be tumed to complete the electrical circuit.這個(gè)電路需要兩個(gè)開關(guān)才能完成。 3.circulate v.go around continuously,diffuse（使）流通，，（使）運(yùn)行，（使）循環(huán)，（使）傳播 （使成圓形） *circ (=around),lat(=carry) 例句：This herb is believed by the Chinese to help your blood circulate.中國(guó)人相信草藥可以促進(jìn)血液循環(huán)。 4.circumference n.perimeter 圓周 （繞行） *circum (=around),fer (=carry) 例句：We learned in geometry that it is possible to caculate the circumference of a circle.學(xué)過幾何后我們知道，圓的周長(zhǎng)是可以計(jì)算出來的。 5.circumspect adj.cautious,well-considered 慎重的，充分考慮的 （仔細(xì)向四周看看） *circum (=around),spect(=look) 例句：Since the accident,the bus company is much more circumspect about hiring inexperienced drivers.自從那次事故以后，公共汽車公司在雇用沒有經(jīng)驗(yàn)的司機(jī)時(shí)更加慎重了。