音标：[ dìngyi ] 发音：
- The first definition, however, is a puzzle .
- Saving is defined as postponed consumption .
- The matrix is defined as the reciprocal of a .
- These definitions are the ones we follow today .
- We can define marital felicity accurately .
- The boundary homorphism d is defined as follows .
- Semitrails and semipaths have analogous definitions .
- This definition disagrees with those definitions .
- That definition leaves much room for disagreement .
- By definition a cataract is an opacity in the lens .