Series wound a.c. motors have as their main characteristic the very large starting torque they can produce at starting or generally at low speed. 串激直流电机的主要特点是，起动或在低速时能产生很大的扭矩。

【答】在这个句子中，主语是Series wound a.c. motors；谓语是 have；宾语是the very large starting torque。因为宾语太长：the very large starting torque they can produce at starting or generally at low speed. 且含有一个定语从句they can produce at starting or generally at low speed。为了匀称起见，把介词短语as their main characteristic（作为主要特点）提到宾语之前。谓语动词和宾语之间被某种成分所分隔，这种现象在英语中是比较常见的。

举一个非常相似的例句：

Do you have as a rule much time for reading? 

= Do you have much time for reading as a rule? 

你平常有许多时间读书吗?

又如：

1. She carries over the shoulder of her leather coat a heavy black purse.

2. When we pass a big building or see an airplane or a car, we might keep in mind that we are looking at the fruits of man’s labour in this tradition.

3. It is better for you to take with you whatever you need most anytime.

4. The critic is he who can translate into another manner or a new material his impression of beautiful things.

5. The discovery has made possible new techniques for brain surgery.

6 . Finally, I dashed down the stairs, pushed open the front door.

7. He was told to speak briefly; accordingly he cut short his remarks.

（注：1-4被介词短语分隔；5-7被作宾补的形容词分隔。）