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Here are some sentences.She is a practical woman.That is a course of practical knowledge.
A real life demonstration is a practical application of something
Science used for practical purposes is technology.
Practical Science are people who do experients to explain the Science theories.
The practical application of science is technology, such as your computer and the internet.
Technology
technology
Technology
hanging drop tecnique have practical value
hanging drop tecnique have practical value
pie
A common belief or practice which may or may not be true or have practical value could be called a tradition or a custom.
It is essentially a scientific toy, with no practical value.
it means points taken away
maybe
Giving something value that has very little practical value. devalues thing that have real value.
A common practice which may or may not be true or have practical value is called tradition. Another word to describe it may be custom.