1) aer, ar, 含义是空气，大气 aeroplane, aerial,
2) ag, act, ig, 含义是做，动作 active, agent, reaction,
3) alt, 含义是高， altitude
4) alter, altern, altr, 含义是其它，变更 alternate,
6) brev, bri, brief, 含义是短 brief, abbreviation, abridge(节略)
7) cap, capt, cept, cip, 含义是取，获 capture, except, concept, capacity
8) ced, ceed, cess, 含义是行，让步 proceed, succeed, excess(过度)
9) centr, centr, 含义是中心 concentrate, eccentric(偏心的)
10) clain, clam, 含义是呼喊 claim, proclaim, exclaim
11) clos, clud, 含义是闭合 conclude, enclose, include
12) col, cult, 含义是耕耘 colony, cultivate, agriculture
13) cor, cord, 含义是心 cordial, record, accord
14) curr, cur, cour, 含义是跑，动作 current, occur, concurrence(同时发生)
15) dic, dict, 含义是说，示 dictate, edit, indicate, predict
16) doc, doct, 含义是教 doctor, document.
17) duc, duct含义是引导，传导 introduce, produce, conduct, deduct( 推论)
18) fact, fac, fect, dic, dit, 含义是做，创造 factory, effect, profit, faculty, perfect
