苹果公司在其网站上公布了对竞争机型的测试。但部分专家和竞争对手对苹果公司测试的有效性表示质疑。
But some experts and competitors questioned the validity of Apple's tests of competing products, which it posted on its website.
这些标识的有效性，主要是公司以专有的方式，通过更高的知名度和品牌认知度来寻求竞争优势。
The effectiveness of these signs, however, has mainly been studied in a proprietary manner by companies seeking a competitive edge through higher visibility and brand recognition.
通过砂培试验研究了标记基因对受体菌株的竞争结瘤能力和固氮有效性的影响。
In the nitrogen-free Pot experiment, the nodulating competitive ability of the parental and marked strains and their nitrogen fixing efficiency were tested.
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