The essay introduces the cause and excluded methods from all aspects through concrete examples.
文章通过具体实例，从各个方面介绍了干扰的形成及排除方法。
Excluded methods: to hopper inside the 15 ~ 30l of water poured into the mud again and again is, reverse to start pumps, forcing the channel to open.
排除方法：往料斗内倒入15 ~ 30l水泥浆，反复正、反向启动泵，迫使通路打开。
Lures and repellents may be used if they do not contain materials listed as prohibited or products produced using excluded methods (genetically engineered).
如果引诱剂和驱避剂中不含禁用物质且没有采用禁用方法(基因工程)生产的，也可以用。
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