美国航空对这次系统升级已经研究了两年多时间，其表示，在对比每一家潜在的竞标者和15家航空公司之后选择了惠普。
American has been studying this upgrade for more than two years and says it chose H-P after looking at every potential bidder and 15 airlines.
对比较在家里或在诊所进行药物流产的随机对照试验和前瞻性群组研究进行系统搜索。
A systematic search for randomized controlled trials and prospective cohort studies comparing home-based and clinic-based medical abortion was conducted.
此刻，研究人员尚未计划将基因组与最广泛使用的操作系统Windows进行对比。
For now, the researchers have no plans to compare genomes to the most widely-used operating system of all, Windows.
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