| 单词 | excursion | 
| 释义 | ex·cur·sion    (ĭk-skûrzhən)n. 1.  A usually short journey made for pleasure; an outing. 2.  A roundtrip in a passenger vehicle at a special low fare. 3.  A group taking a short pleasure trip together. 4.  A diversion or deviation from a main topic; a digression. 5.  Physics   a.  A movement from and back to a mean position or axis in an oscillating or alternating motion. b.  The distance traversed in such a movement. [Latin excursiō, excursiōn-, from excursus, past participle of excurrere, to run out : ex-, ex- + currere, to run; see  kers- in the Appendix of Indo-European roots.]  | 
	
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