1、Before, I know nothing about dark energy. Now, I know that dark energy is a hypothetical form of energy that permeates space and exerts a negative pressure, which would have gravitational effects to account for the differences between the theoretical and observational results of gravitational effects on visible matter.
2、科学家通过对超新星的测量发现重力加速了宇宙膨胀的速度。
3、The received frequency is higher (compared to the emitted frequency) during the approach, it is identical at the instant of passing by, and it is lower during the recession.
第一句好像不怎么通顺呢?
追答主要我们不是学这个专业的,你如果是这个专业你把上面语句再重新整理一下。
第一句好像不怎么通顺呢?
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