海员因船只遇难,手头有一个风筝就可以拯救自己的性命。二次大战时,飞行员跳伞也曾用过类似风筝的装置。美国科学家沃森设计出一种用氮充气的风筝,外壳是铝制的,既轻便又坚固,雷达在数海里外就可以发现。风筝的系绳附装有天线。因此,即使在最偏僻的海域,也能向不同方向发出遇难的消息。一 Seafarers can save their lives by having a kite on hand when the ship is killed. World War II, pilot skydiving also used a kite-like device. US scientist Watson designed a kite inflated with nitrogen, the shell is made of aluminum, both light and sturdy, the radar can be found in a few nautical miles away. Antenna is attached to the kite’s tether. Therefore, even in the most remote areas, can also send messages of distress in different directions. one