短语讲解：

1. And that way they are able to harness 10 to 15 percent more energy.

be able to 能够; 能，会
例句：He will be able to take up his normal routine shortly.
他不久就能处理日常事务。

2. But, some people worry about the need to buy large areas of land for traditional solar energy collectors.

worry about 担忧， 烦恼; 惦念
例句：Don't worry about me; I'm very well.
别为我担心，我很好。


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