My knowledge of the subject is practically nil.
我在这方面的知识几乎等于零。
My knowledge of physics is practically nil.
我在物理学方面的知识，几乎等于零。
The chances of your devising any situation that might get her fired are practically nil.
实际上，你设计的任何局面都不可能让她离职。
The chances of your devising any situation that might get her fired are practically nil.
实际上，你设计的任何局面都不可能让她离职。
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