Most of these books have no practical use.
这些书大部分都没有实际用途。
Much of the information he gleaned was of no practical use.
他所搜集的许多信息没有实用价值。
Much of the information you have gleaned is of no practical use.
你收集到的大部分情报没有实用价值。
What use is science if it has no practical application?
如果没有实际应用科学还有什么用？
What use is science if it has no practical application?
如果没有实际应用科学还有什么用？
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