气球

• It is perhaps easiest to understand the reaction in the case of the toy balloon .
  也许用玩具气球的情况最容易说明这种反作用力。
• These pellets could burst the decoy balloons that would accompany a swarm of warheads .
  这些子弹能摧毁伴随许多枚弹头的假目标--气球。
• The sacks of sand which fastened the balloon down had been replaced by twenty sailors .
  原来拉住气球的土袋现在已经换上了二十名水兵。
• Incendiary ammunition had been developed for use against observation balloons in france .
  在法国，已经研究出用燃烧弹对付侦察气球的办法。
• Contribute a little to either ultra-violet astronomy or x-ray astronomy .
  所以气球携带的仪器对紫外线天文学或Ｘ射线天文学的贡献是不大的。
• Till now, all efforts have been devoted to directing the car rather than the balloon .
  到现在为止，所有的研究是操纵吊篮，而不是操纵气球。
• Balloons have to fly with the wind as they have no engines to drive them against it .
  气球只能顺风飘行，因为气球没有发动机提供动力作逆风飞行。
• The two pipes for the introduction of the hydrogen were fixed at the lower end of each balloon .
  在每一个气球的下部都装上了两根输送氢气的管子。
• The variations of temperature which i produce in the gas provide all the means for ascending or descending .
  我只是靠改变气体的温度来使气球升降。
• It was widely interpreted as a trial balloon aimed at reversing the administration's policy .
  这些话被广泛地解释为企图改变政府政策的一个试探性气球。