reinvent the wheel
Lack of attachment, especially freedom from attachment to worldly things or goals, as in some Eastern philosophies.
(slang, sometimes derogatory) A computer programmer.
A useless product which is advertised as being needed by everybody, but which in fact no one needs.
(idiomatic) To do work unnecessarily when it has already been done satisfactorily by others; to attempt to devise a solution to a problem when a solution already exists.
既に他の人が十分に行っている作業をわざわざ行うべきではありません。代わりに既存のライブラリを再利用しましょう。
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