1. Powder residue that is released upon automatic ejection of a spent cartridge or shell from a firearm. 
   后焰火器射击时，残留弹壳的自动弹射所释放的残余粉末
2. The calcareous internal shell of a cuttlefish, used as a dietary supplement for cage birds or ground into powder for use as a polishing agent. 
   乌贼骨乌贼的钙质内壳，作为笼中鸟的饮食补充物或把它碾碎成粉用作上光剂
3. My favorite sport is surf riding. 
   我喜欢的运动是冲浪。
4. The breaking of waves or surf. 
   冲击海浪或激浪的拍击
5. The surf broke on the rocks. 
   迎头浪冲上岩石四下迸溅。

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