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Como siempre, es una lástima no poder dar puntos a más de una persona, así que asigno los puntos a la respuesta que ha llegado primero.
De todas formas, muchas gracias a todos.
Ada 4 KudoZ points were awarded for this answer
Explanation: Without context, it is hard to suggest the appropriate term in English. In an informal text, "cutting edge" or "cutting edges" may fit. Many of the terms already proposed could imply a plural meaning although they are used in the singluar.