They are joined in the air by 14 air crafts.

他们加入了14架飞行器的空中队伍当中。

An extensive and exhaustive effort including a deep ocean search found no sign of the air craft.

经过广泛而彻底的努力，包括深海搜索，没有发现任何飞机的迹象。

Just as we have for air crafts.

就像我们对飞行器所做的那样。

You can imagine that if an air craft was a single use, almost no one would fly.

你可以想象， 如果飞行器是一次性的，几乎没有人会飞。

The difficulty of making a rocket reusable is much greater than the difficulty of making an air craft reusable.

使火箭可重复使用的难度远大于使飞机可重复使用的难度。

The reset air craft which was already the comet known as 67P will release a robotic lander in the hope of learning more about the origins of the solar system.

登陆67P彗星的航空器将释放出机器人探测器，希望更详细地了解太阳系的起源。