重点讲解：
1. look after
照料；照顾；照管；
eg. They wanted someone responsible to look after the place at night-time.
他们想要个有责任心的人夜间照管这个地方。
eg. He had to look after his invalid brother.
他不得不照看他有病的弟弟。
2. be covered with
覆盖着；布满；
eg. His face was covered with the stubble of several nights.
他几天没刮胡子，脸上胡子拉碴。
eg. Buildings old and new are thickly covered with graffiti.
新老建筑上都有密密麻麻的涂鸦。
3. in search of
寻找；寻求；
eg. They trekked from shop to shop in search of white knee-length socks.
他们拖着步子从一家商店走到另一家，寻找齐膝的白袜子。
eg. They are a lost generation in search of an identity.
他们属于迷惘的一代，想要找寻自我。