... at arm's length 疏远 the rocket of the space shuttle 航天飞机的火箭 the subject of the sentence 句子的主语 ...
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旨在取代老化的航天飞机的火箭原型因为恶劣的天气而被推迟发射。
The launch of a prototype rocket designed to replace the aging shuttle has been delayed by bad weather.
如果我们能利用太阳能为这样的电梯提供动力，我们只需花费乘坐火箭或航天飞机旅行费用的一小部分就能进入太空。
If we could power such an elevator with solar energy, we could simply rise up into space for a fraction of the cost of a trip by rocket or shuttle.
气球的优点是它比航天飞机或火箭便宜。
The advantage of the balloon is that it will be cheaper than a space plane or rocket.
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