Different studies have reported conflicting results. At least some of the confusion is due to the fact that researchers rarely test these substances in any standard way.
不同的研究得出了相矛盾的结果，但至少有些是因为研究者没有使用标准化手段进行测试。
2
At least some of the confusion is due to the fact that researchers rarely test these substances in any standard way.
不同的研究得出了相矛盾的结果，但至少有些是因为研究者没有使用标准化手段进行测试。
3
For that reason, the test of likelihood of confusion is not whether the marks can be distinguished when subjected to a side-by-side comparison.