well-defined

 Longman Dictionary of Contemporary English 5++朗文当代英语 5++LDOCE 5++朗文 5++ˌwell-deˈfined adjective  clear and easy to see or understand 易于辨认理解的；规定得清楚的；明确的 well-defined limits on spending 明确的开支限定

Examples from the Corpus

well-defined• Nor would these, together with electrons, form separate, well-defined atoms.• The resulting system could have a huge angular momentum with a very well-defined direction.• It is now generally accepted that the universe evolves according to well-defined laws.• Imaginary time may sound like something out of science fiction, but it is a well-defined mathematical concept.• well-defined muscles• These plasma cells produce a homogeneous immunoglobulin protein which stains as a well-defined peak in the gamma region.• Authority is top down, and utilizes formal communication channels, usually vertical, and well-defined policies and procedures.• If the world had been created without the exclusion principle, quarks would not form separate, well-defined protons and neutrons.• well-defined rules• The conventions featured a well-defined schedule of events so that the networks' coverage could be planned.

ˌwell-deˈfined adjectiveChineseSyllable  

and to clear easy or Corpus understand see

well-defined
ˌwell-deˈfined adjective
clear and easy to see or understand:
    well-defined limits on spending