重點講解：

1. thanks to 幸虧；歸因于；

Thanks to the automobile, Americans soon had a freedom of movement previously unknown.

由于有了汽車，美國人很快就獲得了前所未有的行動自由j1ZUZmG7nc~EDc2&KS。

2. have a handle on （理解、解決問題的）方法，途徑；

This one was a doozy but we think we finally have a good handle on it now.

這個問題有點麻煩，不過我們認為現在已經能很好的處理它了b;&r4aNbLE9pX05y(r-。

3. react to （作出）反應；回應；

Someone allergic to milk is likely to react to cheese.

對牛奶過敏的人可能對奶酪也有不良反應O7W0K(bwy#oK~b]%lF|&。

4. rely on 依賴；依靠；

Many animals rely on concealment for protection.

許多動物靠藏匿自己來避害5cWdgb3I7,ddUmYJxb;h。