Identify triangles with three letters (ex., say "triangle ABC" or "tri ABC" or simply "ABC").

用三个字母来描述一个三角形(如说三角形abc或tri ABC或简单地说abc)。

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For example, the regular expression ABC will match the string ABC but not DEF.

例如，正则表达式abc将与字符串abc匹配，但不与def匹配。

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To use an ABC, a subclass must inherit from the ABC and override its abstract methods.

要使用 ABC，子类必须继承自此 ABC 并且还要覆盖其抽象方法。

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Brennan - who is leading a White House investigation into the incident told ABC's This Week there were bits and pieces of information about the suspect, but no definitive evidence.

VOA: standard.2010.01.03

The dispute between the broadcast network and the cable distributor arose as the two sought to negotiate a new fee structure to be paid by Time Warner to ABC for rights to transmit the network's programs -- and those of Disney-ABC's other television properties -- over its various cable systems.

CNN: McCain speaks out on Time Warner-ABC flap

Can you imagine that ultra-hypothetical ABC Sunday-night lineup?

CNN: ABC to look at 'Star Wars' live-action TV series

When I arrived in U.S. at that time, the three major networks -- ABC, CBS and NBC -- started Saturday morning shows on a very large scale for children.

CNN: Interview with Nelson Shin