computer n.[C]計算機，電腦：
I hate computer games. 我不喜歡電腦遊戲。
We used the computer to save time. 我們用電腦節約時間。
concentrate v.專注，專心；集中注意力：
Keep the noise down , will you?—I’m trying to concentrate .聲音小點行嗎？我正在努力集中注意力。
concept n.概念，觀念；想法：
It’s difficult to grasp the concept of infinite space.要掌握無限空間的概念很難。
concern v/n.對……有影響；與……相（有）關;擔心的事，關切的事：
The fact that she spends so much time on her own really concerns me.她很多時間都是一人獨處，這讓我很擔心。
The main cocern is that the health of the employees will be at risk.主要讓人擔憂的事是僱員的健康將面臨威脅。
concert n.[C]音樂會，演奏會 [U]一致：
The concert drew a large audience.音樂會吸引了大量的觀眾。
conclude v.推論出；斷定：
Davis concludes from an analysis of traffic accidents that the speed limit should be lowered.戴維斯通過對交通事故的分析認定應該降低時速限制。
conclusion n.結論：
From these facts we can draw some conclusions about how the pyramids were built.從這些事實我們可以得出一些關於金字塔是如何建造的結論。
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