句子主干是itwillpassthroughsharpmetalbars。第一个which引导的定语从句修饰的是sharp metal bars。
First it will pass through sharp metal bars which will tear open the plastic bags in which rubbish is usually packed.
该句子的主干是voicesnowcomefrommanyquarters；句首Justas结构做比较状语，意为"正如...一样"；insisting 引导的分词结构做定语修饰主语voice，分词结构中含有两个并列的由that引导的宾语从句，第二个宾语从句的真实主语是不定式结构to keep... 翻译：就象吸烟问题一样，来自不同领域的声音坚持认为有关全球变暖的科学资料还不完整。
Just as on smoking, voices now come from many quarters insisting that the science about global warming is incomplete, that it's Ok to keep pouring fumes into the air until we know for sure。
目前，研究人员猜测梦是大脑情感自动调节系统的组成部分，当大脑处于“掉线”状态时对情绪进行调整。 【析句】Suspect后面是that引导的宾语从句；逗号之后的现在分词短语regulating moods…作定语，解释thermostat 的意思，句末的while引导一个时间状语从句。
Now researchers suspect that dreams are part of the mind's emotional thermostat, regulating moods while the brain is “off-line”.
分析：主语：Americans；谓语：say；that引导一个宾语从句，还包含有一个省略了关联代词的定语从句，apersoncanbe sureinlife修饰twothings. 当先行词在定语从句中作宾语时，常可省略。
Americans often say that there are only two things a person can be sure of in life: death and taxes.(*)
本句是并列句，前一个分句中，“if”引导条件状语从句，主句主语“it”指代“thetraditionofambition”。 后一个分句中“who”引导一个定语从句修饰“people”，“the educatednotleast amongthem”是“people”的补语。
If the tradition of ambition is to have vitality, it must be widely shared; and it especially must be highly regarded by people who are themselves admired, the educated not least among them。
其引导定语从句。美国是一个大国，国内说着许许多多的方言。
The US is a large country in which many different dialects are spoken.
就是他向我解释的他没有参加会议的原因。 （五）but 有时也用作关系词引导定语从句。
This is the reason that / which he explained to me for his not attending the meeting.
就是他向我解释的他没有参加会议的原因。 （五）but 有时也用作关系词引导定语从句。
This is the reason that / which he explained to me for his not attending the meeting.
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