【句子】

The science of horticulture, in which the primary concerns are maximum yield and superior quality, utilizes information derived from other sciences.
主要目的在于丰富和优质的农艺学利用了其他科学的知识。

【解析】

1.horticulture n.园艺学

Horticulture is the industry and science of plant cultivation.
园艺是一种产业和科学的栽培植物。

2.in which, for which, on which, at which的不同用法

1)这些都是定语从句里面,由which引导的定语从句,介词提前。下面这些介词的使用除了意思上的区别,具体是要以which引导的从句而定的。

①in which可以翻译成在……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可以翻译成为了……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可以翻译成在……的上面,或具体时间的某一天

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可以翻译成在……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)当然第一点只是介词作为基本意思的用法,还有一些固定搭配,得具体情况具体分析。

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"因为电影无聊而睡觉。)

⑤The little creature in which scientists are interested is known as ET.
(这里"be interested in"是词组原因)

⑥This is the book for which he is looking.
(即等于This is the book which he is looking for,这主要是因为look for 这一短语)

3.maximum

1)n.最大量;最大限度;最高点

This hall holds a maximum of seventy people.
这厅最多容纳七十人。

2)adj.最高的;最大极限的

The maximum temperature in July may be 36 Celsius degree.
七月份最高温度可能达到36摄氏度。

4.derive

1)v.获取;得自;起源

We shall derive much benefit from reading good novels.
我们将从优秀小说中获得很大好处。

2)derive不论是用作不及物动词,还是用作及物动词,都与介词from搭配使用,表示“从…得到或派生”。

Anna's strength is derived from her parents and her sisters...
安娜的坚强源自于她的父母和姐姐们。 

【练习】

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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