Words and Phrases
lack n．缺乏；短缺 vt.没有；缺乏
(教材P42)Astronauts' bones and muscles can get very weak in space due to the lack of gravity，so they need to exercise every day，which will help them stay healthy.
在太空中由于缺乏引力，宇航员的骨骼和肌肉可能会变得很弱，因此他们需要每天进行锻炼，这有助于他们保持健康。
[例1] She showed a lack of humour.
她缺乏幽默感。
[例2] He didn't go there because he lacked courage.
他没去那里，因为他缺乏勇气。
[知识拓展]
(1)lack sth. 缺少某物
(2)a lack of... ……的缺乏
for lack of... 因缺乏……
have no lack of... 不缺乏……
(3)lacking adj. 短缺的；缺乏的
be lacking in 缺乏；缺少
