But now it is realized that supplies of some of then are limited, and it is even possible to give a reasonable estimate of their “expectation of life” the time it will take to exhaust all known sources and reserves of these materials.
- realized adj.實作的；已實作的 vt.實作
- supplies n.物資；供應品 v.供應；提供
- limited adj.有限的 n.高級快車
- reasonable adj.合理的；公道的；通情達理的
- estimate n.估計；估價 v.估計；估量
- expectation n.期待；預期
- exhaust v.使精疲力盡；耗盡 n.廢氣；排氣管
- reserves n.儲量；準備金；后備隊 v.儲備；保留；預訂
該句為 and 連接的并列復合句，But now it is realized that supplies of some of then are limited 中 realized 為謂語，it 為形式主語，真正的主語為 that 引導的主語從句 that supplies of some of then are limited.此從句為 A of B of C 的形式，C 修飾 B，B 修飾 A，
在and it is even possible to give a reasonable estimate of their “expectation of life” the time it will take to exhaust all known sources and reserves of these materials.中 謂語為 is,it 為形式主語，真正的主語為 to give a reasonable estimate of their “expectation of life” the time it will take to exhaust all known sources and reserves of these materials.其中 their “expectation of life” 修飾 reasonable estimate；the time 為 their “expectation of life” 的同位語，it will take to exhaust all known sources and reserves of these materials.就是省略了引導詞的定語從句，修飾 the time，
譯：但現在人們意識到，當時的某些物質的供應是有限的，甚至有可能對它們的“預期壽命”作出合理估計，即耗盡所有已知的這些物質的來源和儲量所需的時間，
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