自20世纪70年代以来，针对非洲蛇咬的抗蛇毒素生产厂家数显著减少。
Since the 1970s, the number of manufacturers of anti-venoms against African snake bites has dropped dramatically.
无人问我，世界自把尾巴咬。
结果表明，填充焊丝可以消除铝合金激光自熔焊时的凹陷、咬边等宏观缺陷；
The results show that, the filler wire can eliminate the subside and undercut of butt joints which are inevitable in the laser welding aluminum alloy without filler wire.
结果表明，填充焊丝可以消除铝合金激光自熔焊时的凹陷、咬边等宏观缺陷；
The results show that, the filler wire can eliminate the subside and undercut of butt joints which are inevitable in the laser welding aluminum alloy without filler wire.
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