这些被称为重子声学振荡的东西为测量随时间变化的宇宙的膨胀速度和对暗能量的值施加限制提供另一尺码。
These so-called baryon acoustic oscillations offer another yardstick for measuring the expansion rate of the universe over time and putting limits on the value of dark energy.
不是0，Well，，A，is，not，zero。,如果我在平衡处,释放物体,给它3m/s的,初速度，它开始振荡。
A If I release that thing at equilibrium and I give it a velocity of three meters per second, it's going to oscillate.
如果加速度减小，振荡周期变大。
If the acceleration goes down, the period of oscillation goes up.
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