In contrast, children spent only 9 hours with their single mothers.
相比之下，孩子们和单亲母亲在一起的时间只有9个小时。
2
Seeing conditions (or air turbulence) is the single most important factor that degrades image contrast and planetary detail.
观察的条件(大气扰动)是影响对比度和行星细节的最重要的因素。
3
Even the latest low-power computers consume around 45 watts of power when idle. In contrast, a single SleepServer machine runs at just 300 watts, Agarwal says.