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重点讲解：
1. pay attention to 注意；
Pay attention to traffic regulations.
注意交通规则。
2. due to 由于；因为；
The berry is great for the heart and cardio system due to its high polyphenol antioxidant content.
蓝莓对心脏心血管系统非常有益，因为它有高含量的多酚抗氧化物。
3. by means of 用；以；通过；
We can find the size of something by means of measurement.
我们可以用测量法求得某物的体积。
4. hold on to 坚持（信仰、信念、原则等）；
So hold on to your dreams, one day they may come true.
因此，坚持你的梦想，有一天它们也许会实现。
n. (水、气、电)流，趋势
adj. 流通的
