最近，一些公司已经开始计划更经济实惠的“亚轨道”飞行——在太空无际黑暗的边缘进行更短时间的冒险。
More recently, companies have begun to plan more affordable "suborbital" flights—briefer ventures just to the edge of space's vast darkness.
研制出经济实惠的表面活性剂和驱油体系是关键。
To develop affordable surfactants and oil displacement systems is the key.
制造商期望用经济实惠的电池系统满足严格的可靠性要求。
Manufacturers expect cost-effective battery systems that meet their stringent reliability requirements.
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