Alive and kicking
In good health despite health problems
好端端活着，活蹦乱跳
- Tom is old but still alive and kicking!
汤姆虽已老了，但是身体还是很结实！
As pale as a ghost
Extremely pale
面孔象死人一样苍白，面无人色
- He turned as pale as a ghost when he saw his injured leg.
当他看到受伤的腿的时候，他的脸一下子变白了。
At death’s door
Very near death
病入膏肓，生命危在旦夕
- A.I.G., the world’s most famous insurer, was at death’s door.
世界最知名的保险公司美国国际集团也面临倒闭。
Back on one’s feet
Physically healthy again
（病后）恢复健康，痊愈
- "We'll soon have you back on your feet again," said the nurse.
护士说：“你很快就能康复了。”
Feel on top of the world
To feel very healthy
感觉棒极了，非常健康有活力
- The sea and the warm sun made us feel on top of the world.
海洋和温暖的阳光使我们感到愉快和幸福。
Go under the knife
Undergo surgery
动手术，接受外科手术
- Kelly was about to go under the knife when her surgeon stopped everything.
凯莉的手术就要开始时被她的外科医生给叫停了。
Green around the gills
To look sick
脸露病容；脸色苍白
- Some of the passengers looked kind of green around the gills after the trip!
一些乘客在旅途之后脸色发青！
Sick as a dog
Extremely ill
呕吐得厉害，病得十分严重
- I was sick as a dog after last night's meal.
昨天晚上吃完饭后，我吐得一塌糊涂。
Under the weather
Not feeling well
身体不舒服，心情不好
- I'm feeling a bit under the weather - I think I'm getting a cold.
我觉得有点不舒服——可能是感冒了。
