But finding concrete evidence of illicit trade can be tricky, says analyst Ellen Tyra with the center for advanced defense studies.

高级国防研究中心的分析员艾伦·泰拉（Ellen Tyra）说，找到非法贸易的具体证据可能很棘手。

But there is still no concrete evidence to date to support it.

但迄今为止仍然没有具体的证据支持它。

This is a personal vendetta, and he has no concrete evidence against my client.

这是私仇，而且他没有任何针对我委托人的确凿证据。

Beyond the anecdotal, what concrete evidence do we have for social media's negative effects on its youngest users?

除了轶事之外， 我们还有哪些具体证据可以证明社交媒体对其年轻用户的负面影响？

Physical artifacts would be the most concrete evidence of past intelligent life, but it's not very likely that we will ever find any.

实体手工制品是过去智慧生命存在的最有力证据，但我们不太可能找到这些证据。

In seeking to describe the origins of theater, one must rely primarily on speculation, since there is little concrete evidence on which to draw.

即试图描述戏剧的起源，人们必须主要依靠猜测，因为并没有多少确切证据可以引用。

And then with each one of those themes have some examples and concrete evidence that you can use to support it.

然后，对于这些主题中的每一个，都有一些示例和具体证据可以用来支持它。

Historians are unsure who killed the boys –  many people think it was Richard III, but there is no concrete evidence.

历史学家不确定是谁杀死了这些男孩——许多人认为是理查德三世，但没有具体证据。

This is OK. Because there's really no concrete evidence that 3 percent inflation does any significant harm, compared with 2 percent inflation.

还行吧。因为确实没有具体证据表明 3% 的通货膨胀率与 2% 的通货膨胀率相比会造成任何重大危害。

Eating breakfast has always been associated with better concentration and cognitive function, but concrete evidence to performance has always been somewhat unclear.

吃早餐总是与更好的注意力和认知功能有关，但表现的具体证据一直不太清楚。

Historians are still looking for more concrete evidence, but the indirect evidence indicates that the Olmecs either contributed or laid the foundation for the Maya calendar.

历史学家仍在寻找更具体的证据，但间接证据表明奥尔梅克人为玛雅历法做出了贡献或奠定了基础。

But it was hard to get concrete evidence, not least because the Russian government started to reduce the level of official statistics that it was publishing.

但很难获得具体证据，尤其是因为俄罗斯政府开始降低其发布的官方统计数据的水平。

However, humans have not discovered any concrete evidence  of extraterrestrial organisms.We don't know which planets they live on or what shape they take —  even their chemical composition remains a mystery.

然而，人类还没有发现任何外星生物的具体证据。我们不知道它们生活在哪些行星上，也不知道它们的形状——甚至它们的化学成分仍然是个谜。

More recently, there was concern raised by the EU about potential suicide risk by some people taking these drugs, although that, there is no concrete evidence that this has affected a lot of people.

最近，欧盟对一些服用这些药物的人潜在的自杀风险表示担忧，尽管没有具体证据表明这已经影响了很多人。

While I was trying to fact check this video, I couldn't find any real concrete evidence that the reply girls abused the video response feature, especially because it seems like potentially the original uploader had to approve your video response.

当我试图对这个视频进行事实检查时，我找不到任何真正的具体证据证明回复女孩滥用了视频回复功能，特别是因为似乎原始上传者可能不得不批准您的视频回复。