您要查找的是不是：
- 極光時(shí)現E層auroral sporadic E layer
- 時(shí)現E層sporadic E layer
- 中緯度時(shí)現E層midlatitude sporedic E layer
- 在中緯度中和時(shí)現E層分子和金屬離子的相對濃度Relative concentrations of molecular and metallic ions in midlatitude intermediate and sporadic-E layers
- 赤道時(shí)現E層equatorial sporadic E layer
- 層layer
- 赤道偶現E層equatorial sporadic E layer
- 幾時(shí)what time; when
- 報時(shí)give the correct time
- 單層monolayer
- 人時(shí)man-hour
- 套現arbitrage
- 順時(shí)up time; be in luck; on time
- 內層lining
- 初現peep
- 薄層folium
- 必要時(shí)in a pinch
- 折現realization
- 層數number of plies
- 限時(shí)in limited time
