Scales 称体重  
  
A lady noticed her husband standing¹ on the bathroom scale, sucking in his stomach.
妻子看见丈夫站在卧室的秤上面，拼命吸气收腹。

Thinking he was trying to weigh less with this maneuver². she commented, "I don't think that's going to help."
妻子以为丈夫这样做是为了让体重看起来轻一些，就说：“我可不觉得你那样做会有什么用。”

"Sure it will." he said. "It's the only way I can see the numbers."
“当然有用了。”丈夫说：“只有这样我才能看见秤的仪表盘。

Notes:

scale 秤
sucking  往回吸，收腹
maneuver 巧计，策略