However, try as hard as they might, scientists have yet to detect any of these particles, even with tests designed specifically to target their predicted properties.
可是，不管科学家如何努力，甚至用专门设计出的，检测其预期性质的实验，也没能探测出任何此类粒子。
It is hard to detect a small target in a complex background using a conventional algorithm, especially when IR target has few pixels, many fake targets will be detected.
在复杂红外背景中如果红外点目标所占的像素少，通常的检测方法就很难将目标检测出来，且往往会含有较多假目标。
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