重點講解：
1. in an effort to do sth.
努力，試圖做某事；
eg. She has been studying very hard in an effort to catch up with her classmates.
她學得非常努力，以便趕上她的同學。
eg. They attacked furiously in an effort to score a tying goal.
他們猛烈進攻，企圖得一分以打成平局。
2. be oblivious to/of sth.
不知道的；未注意的；未覺察的；
eg. She lay motionless where she was, oblivious to pain.
她一動不動地躺在原地，已經感覺不到疼痛。
eg. Llewelyn appeared oblivious of his surroundings.
盧埃林看起來沒有注意到他周圍的情況。
3. in sb.'s presence
當著…的面；在…面前；
eg. Try not to allude to this matter in his presence because it annoys him to hear of it.
他在的時候千萬別提及這件事，他聽了要生氣的。
eg. Don't say anything about anyone in their absence that you would not say in their presence.
不要在背后說那些你不會在別人面前說的話。