词根记忆：来自calamity(n.灾难)

例:Growing evidence that coastal erosion occurs continuously, not just in calamitous bursts such as hurricanes, has led scientists and planners to urge a stringent new approach to limiting development along the nations shoreline.

9.calcium n.钙(a silver-white divalent metallic element of the alkaline-earth group occurring only in combination)

词根记忆：calc(石头)+ium--僚石头一样硬--钙

例:A new study finds that the more hostility people show in their behavior and attitudes, the more likely they are to have calcium deposits in the arteries of their hearts.

10.calculate v.计算(to count)；估计(to figure out)；推测(to judge to be true or probable)

词根记忆：calcul(计算)+ate(做)--计算；推测

例:The unemployment rates that James calculates appear to be modest.//Canadian scientists have calculated that one human being should be struck every nine years by a meteorite.

派生词：calculated(a．有计划的：适合的)

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