1.Don't be frightened by sharks：you are 30 times more likely to be hit by lightning than be attacked by a shark.

不要惧怕鲨鱼：你被闪电击中的几率要比受到鲨鱼袭击的几率大30倍。 "30 times more...than"是"倍数＋比较级"的用法。 Sound travels more than four times faster in water than in air.

声音在水中传播的速度是在空气中传播速度的4倍多。 2.Though it may seem hard to believe，the bird the officer uses is the same bird often seen in public parks-the pigeon.

虽然这似乎令人难以置信，但那名军官所用的鸟儿和我们常在公园里看到的一种鸟是同样的--鸽子。 though引导让步状语从句，意为"尽管，虽然"。 Though I know Mum is the most important person in my world，I just can't do what she likes me to do.

尽管我知道妈妈是我生命中最重要的人，可是我还是不能做她想让我做的事情。 3.However，it was in war that they found their greatest use.

然而，它们的最大用途却是在战争中被发现的。 "it was...that..."是强调句型。 It was in Asia that the world's greatest cultures had their birth.

世界上最伟大的文化都起源于亚洲。 　　

　　 contrary adj.相反的 n．相反的事实或情况

　　(教材P18)Contrary to what many people might assume，evidence shows that sharks seldom attack humans.

和许多人可能会认为的正好相反，有证据显示鲨鱼极少攻击人类。