open network hard
开放网络硬
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Neural network feature selection is an open issue hard to solve.
神经网络的输入属性选择一直是一个比较困难的问题。
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Closed systems with network effects are hard to build because consumers and competitors prefer the convenience of open platforms.
FORBES: Check Out Those FaceTime Ads: Think Apple Understands The Network Effect?
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