ravens
英 ['rævənz]
美 ['rævənz]
ravens 变化形式
易混淆的单词： Ravens
ravens 双语例句
Pilots might dismiss ravens as radio-controlled toys , but they are popular with soldiers . 飞行员们也许只把“渡鸦”看成无线电控玩具，但士兵们却对它爱不释手。 There are some 4800 ravens in operation in the army , although plenty get lost . 大约有4800架“渡鸦”在军队中服役，不过其中很多都失踪了。 The american army 's entire annual purchase of almost 1300 ravens is thus lighter than a single fully armed reaper . 美军全年采购的1300架“渡鸦”加起来的重量比一架全副武装的“死神”还轻。 Skip to next paragraphjohn m. marzluff , a wildlife biologist at the university of washington , has studied crows and ravens for more than 20 years and has long wondered if the birds could identify individual researchers . 华盛顿大学的野生动物学家约翰马兹卢夫（johnm.marzluff）对乌鸦和渡鸦的研究已经超过20载，他心中一直有个疑问，这些鸟儿能否认出不同的研究人员？ Unlike bigger drones , whose limited numbers mean that officers in the field are in constant competition for their services , ravens are abundant and thus generally available to provide instant video imagery , day or night . 大型无人机因为数量有限，战场上军官们总是在竞争它们的使用权，而“渡鸦”却不一样，它数量充足，基本上能够提供昼夜的即时视频图像。