For reasons unknown to physics, time runs only in one direction. The mind and the heart, curiously, transcend time.

她拿起一只钢笔，在衬页上写到：由于物理学上未知的原因，时间只朝一个方向流逝，而奇怪的是思想和思绪却能超越时间的限制。

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SG_DXFER_UNKNOWN: The data transfer direction is unknown.

SG_DXFER_UNKNOWN：数据的传输方向未知。

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A robust Direction of Arrival (DOA) estimation algorithm for coherent wideband sources in unknown correlated noise fields is investigated in this paper.

提出了一种未知相关噪声环境下，相干宽带源波达方向宽容估计算法。

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But now she is on her own, "with no direction home, like a complete unknown, like a rolling stone."

VOA: special.2009.06.21

Lord Samuel's recent effort in the same direction, An Unknown Country, is even more dismal.

FORBES: Magazine Article

The consequences of these political concessions on the governing capabilities and political direction of Pakistan are still unknown.

CENTERFORSECURITYPOLICY: Pakistani nightmare

But they do risk achieving both of those things during the next decade, a period during which the political direction of China is necessarily unknown.

ECONOMIST: George Bush and Europe: Merci, y'all | The