看起来，模式是有效的标记，但不常用，因为你描述的原因。
It looks like that pattern is valid markup, but not commonly used, for the reason you describe.
你应该集中精力学习你所选择的VCS特征，重要但不常用的。
You should focus onlearning about important but infrequently used features of VCS of your choice.
如果在德国SEO工作中选择了意思正确但不常用的关键词，效果就会大打折扣(参见参考资料)。
If you choose correct but less-used keywords in your German campaign, your results will suffer (see Resources).
禽流感(也称为禽流感或禽流感)是由病毒引起的，通常感染鸟类，但不常用，一直被称为感染猪和一些猫。
The cause of bird flu (also known as bird flu or "bird" flu) by the virus, usually infected birds, but are not normally used, was known to some of the infected pigs and "cats."
联合会说道，这些不常用药物不但不昂贵而且效果显著，可以降低一半以上患并发症的风险。
"These unused drugs are inexpensive and highly effective and can together lower the risk of complications by 50 percent or more," the federation said.
联合会说道，这些不常用药物不但不昂贵而且效果显著，可以降低一半以上患并发症的风险。
"These unused drugs are inexpensive and highly effective and can together lower the risk of complications by 50 percent or more," the federation said.
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