All living things need air to live. People need clean air to breathe. But sometimes people make the air dirty. They drive so many cars that the fumes from the cars pollute the air.
Fumes are made when gasoline is burned. The fumes that come out of cars, buses and trucks can pollute the air.
Environmental engineers are people who work to protect the environment. One of their jobs is to design or plan cars that will not pollute the air. Some time ago environmental engineers designed an object for cars that removes harmful pollution. Now cars are causing less pollution than they once did, because environmental engineers worked hard to protect the environment.
Which is not said that can pollute our air

某村村长甲威信颇高，对本村村民的违法乱纪行为通常采取的措施是关押24小时，从而使违法乱纪现象减少，村民也拍手称快，甲也从未认为自己的行为违法，由于甲的行为稳定了村子的社会秩序，不具有危害性，所以不构成非法拘禁罪

甲男明知乙女只有13周岁，但是以为只要征得幼女同意后就可以与之发生性交，于是在征得乙女同意后与幼女发生了性关系，甲男没有违背妇女意志，所以不构成强奸罪

甲于1987年3月自费出国(出国前曾有嫖娼行为)，在国外期间染上严重性病，并于1999年9月8日回国。甲不知道国家已经规定了传播性病罪，于1999年10月10日嫖娼时被公安人员抓获，甲主观上没有罪过所以不构成传播性病罪

甲化妆拦路强奸妇女，黑夜中将提前下班的妻子当作其他妇女，并对其实施了“强奸”行为，甲的行为构成强奸罪

该清洁工在清扫第2街道之前清扫第1街道。

该清洁工在清扫第5街道之前清扫第2街道。

该清洁工在清扫第2街道之前清扫第3街道。

该清洁工在清扫第5街道之前清扫第6街道。

Standard usage includes those words and expressions understood, used, and accepted by a majority of the speakers of a language in any situation regardless of the level of formality. As such, these words and expressions are well defined and listed in standard dictionaries. Colloquialisms, on the other hand, are familiar words and idioms that are understood by almost all speakers of a language and used in informal speech or writing, but not considered appropriate for more formal situations. Almost all idiomatic expressions are colloquial language. Slang, however, refers to words and expressions understood by a large number of speakers but not accepted as good, formal usage by the majority. Colloquial expressions and even slang may be found in standard dictionaries but will be so identified. Both colloquial usage and slang are more common in speech than in writing.

Colloquial speech often passes into standard speech. Some slang also passes into standard speech, but other slang expressions enjoy momentary popularity followed by obscurity. In some cases, the majority never accepts certain slang phrases but nevertheless retains them in their collective memories. Every generation seems to require its own set of words to describe familiar objects and events.

It has been pointed out by a number of linguists that three cultural conditions are necessary for the creation of a large body of slang expressions. First, the introduction and acceptance of new objects and situations in the society; second, a diverse population with a large number of subgroups; third, association among the subgroups and the majority population.

Finally, it is worth noticed that the terms "standard" "colloquial" and "slang" exist only as abstract labels for scholars who study language. Only a tiny number of the speakers of any language will be aware that they are using colloquial or slang expressions. Most speakers of English will, during appropriate situations, select and use all three types of expressions.

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California needs further actions to inspire other states.

California has set a perfect model for other states to follow.

California will become an excuse for inaction for other states.

California might find it difficult to execute its own policies.