aplite

例句：

1. 1.The universe is made up of about 25% dark matter, which is invisible to the naked eye.
   宇宙由大约25%的暗物质组成，肉眼看不见。
2. 2. Scientists are still trying to understand the nature of dark matter, which is believed to make up most of the mass in the universe.
   科学家们仍在试图理解暗物质的性质，据信它构成了宇宙中大部分的质量。
3. 3. Dark matter has been proposed as a possible explanation for the missing mass in the universe,but it remains a mystery.
   暗物质被提出可能是解释宇宙中缺失质量的可能原因，但仍然是一个谜。