重點講解：
1. in advance 提前；事先；
Because of the popularity of the region, it is advisable to book hotels or camp sites in advance.
鑒于該地區很受人們青睞，最好提前預訂旅館或宿營地_NHV%^N;Q_9Tq。
2. nail down 弄清；確定；
It would be useful if you could nail down the source of this tension.
如果你能弄清這種緊張的根源，將會大有益處[vyGy560Ul。
3. in contrast 相反；
In contrast, the lives of girls in well-to-do families were often very sheltered.
相反，生活在富裕家庭的女孩子通常都備受呵護9C^XG2u;8JxIHJrw。
4. when it comes to 談到；涉及；
It's easy to think that individuals can't make a difference when it comes to the issue of global warming.
當說到全球變暖的問題時，人們似乎都覺得個人的力量微不足道,bxvS.O65LoopE9N9s。