| 词汇 | occasional |
| 词根词缀 | 词源： 1560s, "casual," from occasion. Meaning "happening on or pertaining to a particular occasion" is from 1630s; that of "once in a while" is from 1620s. 词根记忆： a. 偶然的,非经常的,特殊场合的;临时的In occasional case the phrase emphasizes the importance of the phase to the laser.在偶然情况下该短句强调了相位对于激光的重要性. |
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