吃透英语课本，提升在校竞争力
n. 未知的地方（或事物）
adj. 未知的；不详的；不为人知的
复数：unknowns
It was brave of him to go to a place that was unknown to humans at that time.
他很勇敢，到一个当时人类未知的地方去。
A spaceship was trying to land on an unknown planet.
一艘宇宙飞船正试图在一颗未知的星球上着陆。
Thanks to amber, more than 300 unknown species have been discovered.
得益于琥珀，超过300个未知物种已被发现。
For some unknown reason, Mark quit his job and moved to Greece.
不知何故，马克辞掉工作移居希腊了。
The murderer’s identity remains unknown.
杀人凶手身份仍然不明。
An unknown number of people were killed.
丧生人数不详。
a voyage through unknown territory
穿越未知海域的航行
The long-term effects of the drug are still an unknown.
这种药品的长期作用还是个未知数。
unknown soldier
（美）阵亡的无名英雄
unknown number
未知数
fever of unknown origin
无明显病因的发烧
adj.[数]未知的；陌生的，默默无闻的
strange
sealed
n.[数]未知数；未知的事物，默默无闻的人
XYZ
pronumeral
1 ...the scientist confirmed the snake was a previously unknown species after conducting a genetic analysis of tissue samples...
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