c. 1600, from Middle French raréfaction or directly from Medieval Latin rarefactionem (nominative rarefactio), noun of action from past participle stem of Latin rarefacere (see rarefy). Used chiefly in reference to gases.
雙語例句
1. This is called a rarefaction and is represented by widely spaced dots.
這個區(qū)域稱為稀疏區(qū),并用疏散的小點表示.
來自辭典例句
2. The classical elementary waves in Riemann solutions include rarefaction wave, shock wave and contact discontinuity.