検索内容:
mathematical expression; numerical formula
It's difficult to solve this mathematical expression.
minus sign
This equation needs a minus sign.
needed, necessary
Your cooperation is needed for this project.
need, necessity
I need you.
necessity (quality or state of being necessary, unavoidable, or absolutely requisite)
Do you understand the necessity of this project?
unnecessary
That information is unnecessary.
needlessness
That information is completely unnecessary.
necessary evil
He thinks that war is a necessary evil.
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