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5.The satellite also demonstrated how it could provide help to people living in isolated areas where transportation is difficult.
how引導(dǎo)的是一個(gè)賓語(yǔ)從句。我們很熟悉的是that引導(dǎo)的賓語(yǔ)從句，而且that常常可以省略。如：We must remember (that)things are easier said than done. (我們必須記住事情都是說(shuō)起來(lái)容易，做起來(lái)難。)
用連接代詞或副詞引導(dǎo)的賓語(yǔ)從句我們也應(yīng)弄清楚。
provide是一個(gè)常用單詞，通常可以有如下用法：provide sth. to/for sb.; provide sb. with sth.; provide sb. sth.;provide that…，在前一個(gè)單元中，我們已對(duì)provide一詞有過(guò)講解
6.He was then able to follow the doctor's instructions on how to care for the patient.
句子中的on意思為“關(guān)于;有關(guān)”，可用about替換
care of 在句子中的意思是“照顧”，可用attend; look after替換。
care for 還可以解釋為“擔(dān)心”，“介意”，“愿意”，可用about替換for.
1)He doesn't care about/for his clothes. (他不講究衣著。)
2)The old lady cared much for her daughter's safety. (老太太非常為女兒的安全擔(dān)心。
7.The most common use of telecommunication satellites，however，has been for transmitting telephone calls.however
在本句中做副詞用，意思相當(dāng)于but.但是however和but在用法上是有差異的。however不放在句首或句末時(shí)，前后通常都加逗號(hào)，而but則不用。請(qǐng)看例句：
1)It is not，however， the only answer to the question. (然而，這不是問(wèn)題的唯一答案。)
2)I am sorry，but I won't be able to come this time. (很報(bào)歉，我這次不能來(lái)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是一個(gè)形容詞，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. (很報(bào)歉，那些鞋沒(méi)你的尺碼。)
2)If I am not available when you call， leave a message. (你打電話(huà)來(lái)時(shí)如果我不在，請(qǐng)留個(gè)言。)
9.We can prevent this from happening by carefully controlling the new technology.
prevent…from…意思為“阻止…發(fā)生”，也可用stop…from…或keep…from.From在前兩個(gè)短語(yǔ)中可被省去。
Nothing can prevent him (from)going there.(什么也阻止不了他去那兒。)
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