四大问题
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four major problems
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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This paper points out four major problems to be solved in application.
本文指出了实际推广应用需要解决的四个主要问题。
The mechanics problems caused by the four major effects of nanomaterials were studied.
分析了纳米材料的四大效应所带来的力学问题。
If SpaceX avoids major problems during its first four days in space, NASA will give the green light to berth.
WSJ: SpaceX's Pioneering Flight Plans
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