1. profile of spectral line 
   谱线轮廓
2. The shelves sag under the weight of the books. 
   书架因书的重量而下陷。
3. The tent began to sag as the canvas became wet 
   帐篷因帆布湿了中间有些下坠
4. It quiet sag. For today decline tkos just the same. 
   由于市场冷清，故今天婉拒贵方报价，但仍感激不尽。
5. (of a ship) so weakened as to sag at each end. 
   （指船）每个末端都下陷。

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• 1. 凹形纵断面
  (46)sag profile {}凹形纵断面
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