But if improving their hunting luck was the chief motivation for the paintings, it is difficult to explain why only a few show signs of having been speared.
但是，如果增强他们的狩猎运气是这些画的主要动机，那么就很难解释为什么只有少量画作有被长矛刺过的迹象。
Certainly, it would be difficult to explain our RIGS over the phone. May I call on you today or tomorrow?
当然可以，在电话中介绍我们的钻机可能比较困难，我可以在今天或明天去拜访你吗？
Reasoning is also developed early on, although sometimes it is difficult to explain reasoning to a two-year old.
推理的能力在小时候也得以培养起来，尽管有时候向一个2岁的小孩解释推理甚为困难。
Cravings are difficult to explain scientifically, she says, "because people don't eat nutrients; they eat food."
吃的渴望很难从科学上解释，她说。“因为人们不是吃营养，而是吃食物。”
It is difficult to explain what it was like for me watching from the directors' box.
在包厢里看比赛，这感觉很难形容。
"He added:" It's difficult to explain our performances against Sunderland and Chelsea.
他补充道：“对于桑德兰和切尔西的比赛中的表现，我们很难去解释。”
He said: 'It is too difficult to explain how such a mature team as Milan could lose a game like this.
他说：“很难解释为什么一支像米兰这样成熟的球队会这样丢掉一场比赛。”
It is difficult to explain the mechanism of the nanoscale cutting using the traditional cutting theory.
采用传统的切削理论已经很难准确地理解其切削机理。
Around 1990, molecular biologists obtained a number of unexpected results that were difficult to explain.
在1990年左右，分子生物学家得到了一些难以解释的意料之外的实验结果。
It is not difficult to explain the reason for their surprising amount of interest in famous people's lives.
记者对名人生活如此热衷，其原因不难解释。
HR 8799e's relative closeness to its star makes it difficult to explain how both it and its gas-giant companions formed.
HR 8799e与其恒星相对较近的距离使得人们很难解释它以及其它三颗气态巨星的成因。
But the findings in Ghana were more difficult to explain, because deaths from causes other than malaria fell more sharply.
但是在加纳的发现更难以解释，因为除疟疾之外由其他原因导致的死亡降低的更为显著。
It's difficult to explain the feeling - it's a combination of excitement and relief, and the emotions hit you all at once.
在这种情况下进球的感觉很难说清楚——大概是兴奋和释放的结合体，而且这种情绪会立刻将你淹没。
The researchers behind the study of 13,000 children say their results were unexpected and the link was difficult to explain.
研究人员们在研究了13，000 名儿童的情况后说，他们的研究结果是出乎意料的，而且这种关联难以解释。
Lifting the Champions League Cup to the sky was a special feeling, it is difficult to explain this in words. It was wonderful.
高举起冠军联赛奖杯的感觉非常特别，很难用语言来解释，非常的美妙。
It's very difficult to explain and evaluate information owing to the isotopic pollution which leads to untruth well log information.
由于存在同位素污染，造成测井资料失真，给解释评价带来困难。
Dark flow, he said, "would be much more difficult to explain theoretically if it extended [2.5 billion light-years] and then just stopped."
他说，“如果黑暗流延伸[25亿光年]然后戛然而止，那么理论上就更加难以解释。”
It would have been difficult to explain why he was on board without awakening Passepartout's suspicions, who thought him still at Bombay.
实际上他也很难向路路通解释清楚他为什么也在这条船上而不会引起对方的怀疑，因为，路路通还以为他现在是在孟买呢。
The immune system's rejection of transplanted organs has been difficult to explain from an evolutionary perspective, according to Garcia.
据Garcia讲，免疫系统对移植器官排斥很难从进化论角度解释。
Despite this, researchers in the field have found it difficult to explain exactly how caloric restriction produces these favourable effects.
尽管如此，研究人员发现很难准确解释为什么能量限制能产生如此良好效果。
The enjoyment of Nature is an art, depending so much on one's mood and personality, and like all art, it is difficult to explain its technique.
大自然的享受是一种艺术，与一个人的心境和个性极有关系，同时，和一切的艺术一样，其技巧是很难说明的。
It seems difficult to explain why Skyscrapers and economic crisis are so closely connected simply by coincidence. So what on earth are the reasons for that?
摩天大楼与经济危机的关联如此密切，很难用巧合来理解，那么究竟是什么原因让经济危机总是与摩天大楼如影随形呢？
Humans are highly complex social primates and, because of this, our responses to the world can be difficult to explain with simple biology or neurotransmitters.
人类是高度复杂的社会性灵长类动物，所以我们对外界的反应很难用单纯的生物学或神经传递素来解释。
It is not difficult to explain why such a "fireman" effect might exist. They are typically athletic men who face great physical risks, as a means of saving strangers' lives.
不难解释，消防员效应的存在，因为他们都是典型的体格健壮型男子，而且总是面对极大的身体风险，需要去拯救陌生人的生命。
"It is difficult to explain why our home form is not good," said Benitez. "we are controlling all the games, we are passing the ball well, controlling almost everything."
很难解释为什么我们的主场状态不好，我们控制了所有主场比赛的形势，我们的传球很好，几乎控制了一切。
"It is difficult to explain why our home form is not good," said Benitez. "we are controlling all the games, we are passing the ball well, controlling almost everything."
很难解释为什么我们的主场状态不好，我们控制了所有主场比赛的形势，我们的传球很好，几乎控制了一切。
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