While the students found the soldier's idea interesting, the system was too difficult to be of practical use.

虽然学生们都觉得士兵的想法非常有趣，但这一方法太过复杂，并不实用。

Hopefully, the breadth of material which is covered within this book means that it will still be of practical use for researchers or graduate students.

希望 这本书所涵盖的材料的广度意味着它仍然对研究人员或研究生有实际用途。

Those deposits are of great interest to scientists and may also be of practical use, providing water or rocket fuel to future lunar bases and the rockets launching from them.

这些沉积物引起了科学家们的极大兴趣，也可能有实际用途，为未来的月球基地和那里的火箭发射提供水或燃料。

He did however, try to develop a substance that would be of practical use during the war – a substance, or a kind of material, that would help blood clot.

然而，他确实尝试开发一种在战争期间有实际用途的物质——一种可以帮助血液凝固的物质， 或一种材料。