良好的动机一定要取得良好的效果，良好的目的一定是通过良好的手段来实现的。
A good motive must lead to good effect, and a good purpose must be realized by good measures.
如今，在线内容还成为了争取在自然搜索引擎中更高排名的首要工具，通过使用含相关关键词、彼此混杂的内容以实现良好的效果并降低营销成本。
It's also now a primary tool used in the battle for natural search engine rankings by using content interwoven with relevant keywords to gain high results and low cost marketing.
提出了数字跟踪窄带滤波方法，实现的自适应跟踪方法简便，消噪效果良好。
A digital tracking filter method is put forward, its approach realizing adaptive tracking ability is simple and easy, and good effect of noise cancellation can be obtained.
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