重点讲解：
1. thanks to
多亏；由于；
eg. The play succeeded thanks to fine acting by all the cast.
由于全体演员的出色表演，那出戏才获得成功。
eg. Thanks to his presence of mind the passengers were saved.
由于他沉着冷静，旅客们得救了。
2. of all
（用于强调first， last或最高级形容词或副词）最，最为；
eg. Now she faces her toughest task of all.
现在她面临着最艰巨的任务。
eg. None of you can complain, Peter least of all.
你们谁都不应抱怨，彼得尤其不应该。
3. be covered in
用…遮盖；把…铺在…上；
3. eg. His clothes were covered in dirt.
他的衣服沾满了污垢。
eg. The old man's face was covered in lines and wrinkles.
那老人的脸上布满皱纹和褶子。