lack / læk /n.    缺乏;短缺.没有;缺乏【人教版高中英语必修三 unit 4 （单词与全书例句）】

 lack 

/ læk /

n.    缺乏;短缺.没有;缺乏

-----------------

1. 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.

2. Astronauts' bones and muscles can get very weak in space due to the lack of gravity, so they need to exercise every day to help them stay healthy.

1. 宇航员在太空中由于缺乏重力，骨骼和肌肉会变得非常脆弱，所以他们需要每天锻炼，这有助于他们保持健康。

2. 宇航员在太空中由于缺乏重力，骨骼和肌肉会变得非常脆弱，所以他们需要每天锻炼，以帮助他们保持健康。


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