(两个点号)为Lua的字符串连接操作符 ，lua 5.1中， 在字符串前放置#(井号)来取得字符串长度（长度操作符（length operator）） 5.table
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The operator half length takes to 4-6 and each wave length takes 3 sampling, then the precise wave field can be obtained.
用该方法实现弹性波正演模拟只要算子半长度取到4—6，每波长取3个采样点即可获得精度很高的波场值。
The buttonholes programmed by the operator are sewn sequentially; the respective cutting length is allocated fully automatically. This means maximum efficiency, even for short runs.
因此，在完成一种锁眼后无需做其他的调节，机器根据操作人员编制好的程序序列，自动地改变切孔长度进行锁眼，极大程度地提高了生产效率。
Double transducer control, flexible bag length cutting, operator needn't to adjust the unloading working, time and film savable.
双变频器控制，袋长即设即切，无需调节空走，一步到位，省时省膜。
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