您要查找的是不是：
- polymorphous delta activity, PDA 多形性δ波
- frontal irregular rhythmic delta activity 额部不规则节律的德尔塔波活动
- intermittent rhythmic delta activity 间歇性节律性δ活动
- PDA, polymorphous delta activity 多形性δ波
- There are fertile fields in the Nile Delta. 尼罗河三角洲土地肥沃。
- The office has been humming with activity. 办公室一直忙着搞活动。
- The threat of war has depressed business activity. 战争的威胁使经济萧条。
- There has been a lot of activity in the town today. 今天市中心相当热闹。
- The town was humming with activity. 该市镇生气勃勃，呈现一片热闹的景象。
- Stamp collecting is my favorite activity. 集邮是我最喜爱的消遣。
- The store was a scene of great activity. 这家商店顾客盈门。
- He once engaged in anti-government activity. 他一度从事反政府的活动。
- The office is humming with activity. 办公室里一片忙碌。
- The Nile divides near its mouth and forms a delta . 尼罗河于近河口处分岔，形成一个三角洲。
- A center of interest or activity. 中心兴趣或活动的中心
- Disarm added to Delta Operator and Force Recon. 为三角洲特种部队和武装侦察兵增加了拆卸技能。
- Showing no optical activity in polarized light. 无旋光的极化光下无光学反应的
- A variant of the swept-back wing is the delta wing. 后掠翼的变型是三角翼。
- An increase, as in movement or business activity. 进步，改进，改善运动或商业活动的进步或兴隆
- They were the terror of the Ganges delta. 他们已成为恒河三角洲的令人胆寒的力量。
