1.knackered (adj.)筋疲力尽的
Having worked round the clock, I'm completely knackered.
忙了一天一夜，我累得筋疲力尽。
2.exhausted (adj.)疲惫的；耗尽的
You may be physically and mentally exhausted after a long flight.
长途飞行后，你可能会感到身心疲惫。
3.pound (vi.)连续重击，猛击
His heart was pounding，as if he were frightened.
他的心怦怦跳，似乎被吓坏了。
4.hammer (n.)铁锤；链球
He was chipping away at the rock with a hammer.
他在用铁锤把那块岩石一小块一小块地敲下来。
5.although (conj.)虽然，尽管
Although the coral looks hard, it is very delicate.
珊瑚虽然看上去坚固，实际上非常易碎。