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　　First it will pass through sharp metal bars which will tear open the plastic bags in which rubbish is usually packed.

　　结构： 全句有3个谓语动词：will pass，will tear和is。其中主句的是will pass。句子主干是it will pass through sharp metal bars。第一个which引导的定语从句修饰的是sharp metal bars。第二个which引导的定语从句修饰的是the plastic bags。这是大定语从句里面还有一个小定语从句。句子可以拆分为：

　　1. First it will pass through sharp metal bars.

　　2. The metal bars will tear open the plastic bags.

　　3. Rubbish is usually packed in the bags.

　　翻译：首先，垃圾要通过尖的金属棒，金属棒会把装垃圾的塑料袋弄破。