托福阅读每日一难句：2017年4月3日
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Scientists felt that they could get an idea of how long the extinctions took by determining how long it took to deposit this one centimeter of clay and they thought they could determine the time it took to deposit the clay by determining the amount of the element iridium (Ir) it contained. (TPO8, 52)
词汇：
extinction /ɪk'stɪŋkʃən/ n. 灭绝，绝种;熄灭
deposit /dɪ'pɑzɪt/ v. 将(钱)存入银行; 付(定金);放下某物;使(淤泥等)沉积
clay /klei/ n. 粘土
分析：
修饰一：(of how long the extinctions took)，介词短语
修饰二：(by determining) ，介词短语
修饰三：(how long it took to deposit this one centimeter of clay) ，从句
修饰四：(it took to deposit the clay) ，从句，修饰time
修饰五：(by determining the amount of the element iridium (Ir) ) ，介词短语
修饰六：(it contained. ) ，从句，修饰iridium
参考翻译：
科学家感觉他们可以通过确定这层一厘米黏土层的沉积时间就可以知道灭绝所用的时间，而他们认为可以通过确定黏土层包含铱的含量能确定它(黏土层)所沉积的时间。
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