不得而知

Rats fed tasty 'jelly shots' containing alcohol during adolescence became bigger risk-takers than teetotaller rats when presented with a lever game designed by Ilene Bernstein and her colleagues at the University of Washington in Seattle.

在较早的年纪滥用酒精的老鼠显示出决断能力的减退。然而，不良选择是导致饮酒的患病因素或者是由易于饮酒导致的结果，这个问题不得而知。为了检测存在于青春期自动饮酒和成年以后的决断力之间的因果关系，用啮齿动物模型进行了现在的研究。

Whether he reviled the attention or found it titillating, the negative publicity certainly cost him commissions.

对于这些报道他是予以斥责还是令他兴奋不已我们不得而知，可以确定的是那些负面性的报道让他付出了代价。

After survey, we study the wide-diameters of undirected de Bruijn graphs in Chapter 3, and

在一般性的纵览之后，就进入第三章；虽然无向迪布恩图的连通性早就知道了，但是宽直径却一直不得而知，在这一章中，我们探讨宽直径，从而保证对任意两点都有足够多条的不同路径，而这些路径都不会太长。

Though protesting Chiang's bombings, UNRRA did not break off relations with the generalissimo.

蒋介石本人是否考虑过他这个行动的政治后果，我们不得而知。

But because soft tissue like the vocal cords, larynx, tongue, uvula and brain are not preserved in the fossil record, we don't know when our ancestors evolved the physical capacity to make speech or how long it took to develop.

然而由于诸如声带、喉、舌头、小舌以及大脑这样的软组织并没能保留在化石当中，所以我们的祖先究竟是在什么时候进化出说话的能力，以及经过多长时间这种能力才最终被人类掌握，我们不得而知。

But until today, the specific crimes Waldheim was accused of were not known, nor was it known what these accusations were based on.

但直到今天， Waldheim 以何种罪行被起诉还不得而知，也不知起诉会基于何种指控。

BACKGROUND: Immersive virtual reality is a novel form of distraction analgesia, yet its effects on pain-related brain activity when used adjunctively with opioid analgesics are unknown.

背景：沉浸式虚拟现实是一种通过分散注意力达到镇痛作用的新方法，然而，它和阿片类药物联合应用对疼痛相关大脑活动的影响尚不得而知。

Chitra Gopal, an analyst with Nomura Securities in Singapore who follows the company closely, says BYD is betting on "entirely new technology, and the ability to produce it at scale and at a low cost remains unproven."

屈特拉·戈伯尔是野村证券新加坡分公司的分析师，他也密切关注着这家公司的动向。他认为BYD&完全把宝押在新技术上，而其是否能进行低成本的量产仍不得而知。&

It is almost fall in an instant. The little tortoise we called "Xiao Feng" just like the name of the son of the HNA group's boss who is exploiting us day by day is growing up. He is very healthy and edacious. Fortunately, He is also the only company stay with me in this empty room.

这只是在这个慵懒午后在脑中盘旋的无数念头中的一个，这念头仿佛和我头顶上那台不断掉渣子的空调无关，也和办公室里身材健硕却哼着儿歌的姐姐无关，当然，或者和北京今天令人足够诧异得一塌糊涂的湛蓝的天气有关也不得而知。

Socratididion's Epipsychidion, no man, not a woman, will ever know.

也就是说，'好苏格拉底的灵魂的分身'——那儿学到了什么，任何男人或女人都永远不得而知。

And Pharaoh spoke to Joseph, saying, Your father and your brothers have come to you.

47：5 法老对约瑟说，你父亲和你弟兄们到你这里来了。

Additionally, the approximate flattening of surface strip using lines linking midpoints on perpendicular lines between geodesic curves and the unconditional extreme value method are discussed.

提出了用测地线方程、曲面上两点间短程线来计算膜结构曲面测地线的方法，同时，采用测地线间垂线的中点连线和用无约束极值法进行空间条状曲面近似展开的分析。