重点句型
1. Although surprised, the poachers had an advantage — there were more of them.
偷猎者虽然感到惊慌，但他们占有优势——他们人多。

2. Often working at night, the poachers shoot whole herds of antelopes at a time, leaving only the babies, whose wool is not worth so much.
那些偷猎者常常是夜里出动，一次就捕杀掉整群的藏羚羊,只留下那些毛不那么值钱的幼崽。

3. Over the next ten years about 3,000 poachers were caught and 300 vehicles confiscated.
在接下来的10年里,大约有3,000名偷猎者被抓获并有300辆汽车被没收。

4. The WWF believes that our world has a future only if people learn to conserve nature and not waste energy.
世界自然基金保护组织相信，只有人们学会保护自然，不浪费能源，我们的世界才有未来。

句型探究
1. Although surprised, the poachers had an advantage — there were more of them.
偷猎者们虽然感到惊慌，但他们占有优势——他们人多。
该句中Although 后省略了they were，在时间、条件、让步状语从句中，若从句的主语和主句的主语一致，且从句中含有be 动词，这时可以把从句的主语和be动词省略。
When (he was) walking in the street, he met his English teacher.
当在街上散步时， 他遇到了他的英语老师。
另外，在状语从句中，若从句的主语是it, it又没有实际意义，而且从句中又含有be动词，这种情况下，也可省略从句的主语it和be动词。
If (it is ) possible, I will go to Shanghai with you.
如果可能的话，我和你一起去上海。

2. Over the next ten years about 3,000 poachers were caught and 300 vehicles confiscated.
在接下来的十年中,大约有3000名偷猎者被抓获和300辆汽车被没收。
句中and连接的是两个并列句，第二个分句省略了助动词were。在并列句中，如果后面分句中有和前面分句相同的成分，就可以省掉，以免重复。
Some of us were clearing the windows and others (were) sweeping the floor.
我们中的一些人正在擦窗子，其他人打扫地板。