And watched three-spined stickleback fish hunt water fleas, to the accompaniment of either white noise calibrated to match the noise level of speedboats or a silent track as a control.
并控制三刺鱼在跟快艇噪音程度相当的白噪声中，或者完全安静的环境之下，观察它们捕食水蚤的情况。
2
Stackingimproved the signal-to-noise ratio and enabled the researchers to moreclearly track the path and behaviour of each unique signal as it passedthrough the lunar interior.
叠加提高了信号的信噪比，使研究人员能够更清楚地跟踪每一个独特的信号在月球内部传播的路径和行为。
3
Itsrevolutionary technology means that propulsion comes from the track, not thetrain, resulting in low noise, speeds of up to 285 km/h and a journey time ofjust eight minutes.