派生词:cataclysmic(a.大变动的:洪水的)
同根词:catastrophe(n.大灾难)
6.cataclysmic a.大变动的( of a sudden violent change or a disaster)
词根记忆:来自cataclysm(n.巨变;灾难)
例:Elements heavier ihan helium would remain there if it were not for the cataclysmic supemova explosions.
7.catalog(ue) n.商品目录(complete list of items);v.为…编目录(to make a catalog of)
例:Kim purchased some items from acatalog for $8 each.//Such artifacts are already cataloguedin museum collections.
8.catalyst n.催化剂(a substance th-at eabes achemical reaction to proceed at a usually faster rate);促使事物发展的因素(a person or a thing that causes a change)
词根记忆:cata(下面)+lyst(=lysis溶解)--促进溶解--催化剂
例:The new taxes imposed by the government were a catalyst for revolution.
同根词:analyst(n.分析家)
9.catalytic a.催化的,起催化作用的(causing, involving, or relating to catalysis)
例:Many people who own cars made before 1993 have had catalytic converters installed in their cars.
派生词:catalytically(ad.催化地)
10.catastrophe n.灾难,灾祸(disaster)
词根记忆:cata(下面)+strophe(辖)--天转地覆--灾难
例:The perceived threat of nuclear catastrophe decreases the willingness of people to postpone consumption.
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