評論
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重點講解：
1. now and then 時而；有時；
Now and then they heard the roar of a heavy truck.
他們不時地聽到大卡車的轟鳴聲。
2. go down （價格、水平或數量）下降，下跌；
Crime has gone down 70 percent.
犯罪率下降了70%。
3. a number of 若干；許多；
This equipment has saved the lives of a number of new born children.
這套設備已經挽救了許多新生兒的生命。
4. learn from （從…中）吸取（教訓）；
I am convinced that he has learned from his mistakes.
我深信他已從錯誤中吸取了教訓。
