• 1. But Cannot Be Seen: 却看不到你

• 1.Dark matter is a form of stuff that does not interact with light, so cannot be seen, but makes its presence felt by exerting a gravitational pull on normal matter.
  暗物质是一种不与光发生作用的物质，因而不可见。但是暗物质又是确实存在的，它与可见物质之间产生的引力效应证实了这一点。
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• 2.One can witness a slightly yellower change in the color of the dog's skin, but to the naked eye, fluorescence cannot be seen without the presence of UV light and goggles.
  人们可以看到狗的皮肤颜色稍微变黄，但对于肉眼而言，荧光在没有紫外光照射和未使用护目镜时不会被看到。
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• 3.But this cannot be seen to happen only on Rwanda's terms.
  但这一切却无法得到解决，除非按照卢旺达的条件来办。
  dict.yoduao.com

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