| 单词 | direction of wave |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔primary wave〕An earthquake wave in which rock particles vibrate parallel to the direction of wave travel. It can travel through solids and liquids.地震纵波：岩石微粒的振动平行于地震波传播方向的地震波，它可通过固体和液体美国传统〔secondary wave〕An earthquake wave in which rock particles vibrate at right angles to the direction of wave travel. It can travel through solids but not through liquids.次级波：一种地震波，其范围内的岩石颗粒随波振方向成直角振颤，这种波能穿过固体但不能穿过液体美国传统 |
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