但真正的问题是，理想模型往往建立在需求高峰与利用率饱和的假设之上。而真实世界中的利用率，从来不会长期维持在高位。
Keep track the history of the keyword to determine when a keyword is rising or down in popularity over time.
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"I feel like he's at the point where he wants to bring his music to as many people as possible," she adds.
const MS = window.MediaSource || window.ManagedMediaSource;