重點講解：
1. as a result of 結果；
There was no positive evidence that any birth defects had arisen as a result of Vitamin A intake.
沒有確鑿證據證明，攝取維生素A會導致出生缺陷!rgp+lN.N=Wt1。
2. set out to do sth. 開始；著手；
We set out to find the truth behind the mystery.
我們開始著手揭開謎團背后的真相%-4[~8U7,TSlCR%。
3. be attributable to 可歸因于…的，可歸結于…的；
10,000 deaths a year from chronic lung disease are attributable to smoking.
吸煙導致每年有1萬人死于慢性肺病;Mre]lAFk4A;xABhvE9c。
4. after all 畢竟；終究；
I thought you might know somebody. After all, you're the man with connections.
我以為你可能認識某個重要人物@iLC[&=IR=GjmUbH。畢竟你交游甚廣Q!e7YMHg%_V。