5.The satellite also demonstrated how it could provide help to people living in isolated areas where transportation is difficult.
how引导的是一个宾语从句。我们很熟悉的是that引导的宾语从句，而且that常常可以省略。如：We must remember (that)things are easier said than done. (我们必须记住事情都是说起来容易，做起来难。)
用连接代词或副词引导的宾语从句我们也应弄清楚。
provide是一个常用单词，通常可以有如下用法：provide sth. to/for sb.; provide sb. with sth.; provide sb. sth.;provide that…，在前一个单元中，我们已对provide一词有过讲解
6.He was then able to follow the doctor's instructions on how to care for the patient.
句子中的on意思为“关于;有关”，可用about替换
care of 在句子中的意思是“照顾”，可用attend; look after替换。
care for 还可以解释为“担心”，“介意”，“愿意”，可用about替换for.
1)He doesn't care about/for his clothes. (他不讲究衣着。)
2)The old lady cared much for her daughter's safety. (老太太非常为女儿的安全担心。
7.The most common use of telecommunication satellites，however，has been for transmitting telephone calls.however
在本句中做副词用，意思相当于but.但是however和but在用法上是有差异的。however不放在句首或句末时，前后通常都加逗号，而but则不用。请看例句：
1)It is not，however， the only answer to the question. (然而，这不是问题的唯一答案。)
2)I am sorry，but I won't be able to come this time. (很报歉，我这次不能来了。)
8. Telecommunication can make information from around the world available to use quickly and easily， but some people worry that this may be a risk to our privacy.
available是一个形容词，意思是“可得到的;可用的;有效的”。
1)I am sorry those shoes are not available in your size. (很报歉，那些鞋没你的尺码。)
2)If I am not available when you call， leave a message. (你打电话来时如果我不在，请留个言。)
9.We can prevent this from happening by carefully controlling the new technology.
prevent…from…意思为“阻止…发生”，也可用stop…from…或keep…from.From在前两个短语中可被省去。
Nothing can prevent him (from)going there.(什么也阻止不了他去那儿。)
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