Keep track the history of the keyword to determine when a keyword is rising or down in popularity over time.
be difficult to set up
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参赛作品要求设计方向：题材不限，但须结合产品的「透视窗」物理特性，考虑 CD 旋转时的动态视觉效果，而非简单的图案覆盖。
Despite her increasingly public profile, fans were surprised to see the singer pop up on BBC quiz show The Weakest Link earlier this month.