C = capacity; century; chapter; centigrade; cost; city; center
cal = calendar; caliber; calories
cap = capital; captain
cat = catalog
cc = carbon copy (复印件；抄送)
CEO = chief executive officer
cert = certificate
CFM = confirm
cncl = cancel
cp. = compare
cit = citizen
civ = civil; civilization
clk = clerk
cml = commercial
co. = company
c/o = care of(转交)
col = college; color
com = commentary; common; communication; community
comm = commission
comp = complete; computer; competition
con = conclusion; against
cond = condition
cont. = continent; continued
corp = corporation
cust = customer; custom; customs
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