Dark energy, however, is an unknown unknown.
但是，暗能量却是一个未知的未知。
Unknown-exit code 3-indicates a service is in unknown state.
UNKNOWN—退出代码3—表示服务处于未知状态。
On the road, not for travel, not for someone, only to meet the unknown in the unknown.
在路上，不为旅行，不因某人，只为在未知的途中遇见未知的自己。
The unknown primary site was found in 72.7% (16/22) of patients with unknown primary HN cancer.
在未知原发头颈部肿瘤患者中有72.7% （16/22）检出未知的原发部位。
The unknown system is composed of known part and unknown part.
将未知系统分为已知部分和未知部分。
The unknown long-term affects can not be addressed because, well, they are still unknown.
而其未知的长期影响则无法处理，因为它们是未知的。
The unknown long-term affects can not be addressed because, well, they are still unknown.
而其未知的长期影响则无法处理，因为它们是未知的。
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