【句子】

The science of horticulture, in which the primary concerns are maximum yield and superior quality, utilizes information derived from other sciences.
主要目的在于豐富和優(yōu)質(zhì)的農(nóng)藝學(xué)利用了其他科學(xué)的知識。

【解析】

1.horticulture n.園藝學(xué)

Horticulture is the industry and science of plant cultivation.
園藝是一種產(chǎn)業(yè)和科學(xué)的栽培植物。

which, for which, on which, at which的不同用法

1)這些都是定語從句里面，由which引導(dǎo)的定語從句，介詞提前。下面這些介詞的使用除了意思上的區(qū)別，具體是要以which引導(dǎo)的從句而定的。

①in which可以翻譯成在……里面

The school (that/which) he once studied in is very famous.
= The school in which he once studied is very famous.

②for which可以翻譯成為了……目的

Tomorrow I will bring here a magazine (that/which) you asked for.
= Tomorrow I will bring here a magazine for which you asked.

③on which可以翻譯成在……的上面，或具體時(shí)間的某一天

I have a dresser in my bedroom, which there are many cosmetics on.
= I have a dresser in my bedroom on which there are many cosmetics.

④at which可以翻譯成在……里面或在……

The dumpling House which he often has dumplings at is very popular.
= The dumpling House is very popular, at which he often has dumplings.

2)當(dāng)然第一點(diǎn)只是介詞作為基本意思的用法，還有一些固定搭配，得具體情況具體分析。

①The plane may be several hours late, in which case there’s no point in our waiting.
（固定搭配：in the case)

②The speaker paused to examine his notes, at which point a loud crash was heard.
（固定搭配：at the point)

③Ten years of hard work changed her greatly, for which reason he could hardly recognize her at first sight.
（固定搭配：for the reason）

④The film at which I fell asleep was very boring.
（Here "at which" is based on "fell asleep at the film"因?yàn)殡娪盁o聊而睡覺。）

⑤The little creature in which scientists are interested is known as ET.
（這里"be interested in"是詞組原因）

⑥This is the book for which he is looking.
（即等于This is the book which he is looking for，這主要是因?yàn)閘ook for 這一短語）

3.maximum

1)n.最大量；最大限度；最高點(diǎn)

This hall holds a maximum of seventy people.
這廳最多容納七十人。

2)adj.最高的；最大極限的

The maximum temperature in July may be 36 Celsius degree.
七月份最高溫度可能達(dá)到36攝氏度。

4.derive

1)v.獲?。坏米?；起源

We shall derive much benefit from reading good novels.
我們將從優(yōu)秀小說中獲得很大好處。

2)derive不論是用作不及物動詞,還是用作及物動詞,都與介詞from搭配使用,表示“從…得到或派生”。

Anna's strength is derived from her parents and her sisters...
安娜的堅(jiān)強(qiáng)源自于她的父母和姐姐們。?

【練習(xí)】

Wind power is an ancient source of energy ______ we may return in near future.
A. in which ??B. by which
C. to which ?D. from which

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