____: ad. In the end, especially after a long time or a lot of effort 最终;终于
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____: n. the rate at which a sound wave, light wave, or radio wave moves up and down 震动频率
____: ad. In a way that is related to sight. 视觉上;看的见地;形象化地
____: a. concerning the first and easiest part of a subject; basic 初级的
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