重点讲解：
1.come from
来自于；来源于；出生
例句：One writer believes that the expression might have come from an old saying.
一个作家认为这种表达或许来自一个古老的说法。
2.sprout up
出现
例句：Imitators began to sprout up all over the country.
模仿者开始在全国迅速出现。
3.believe it or not
信不信由你
例句：Believe it or not- not that I don't love Mary- but that I love my country more.
信不信由你，并非我不爱玛丽，而是我更爱我的国度。
4.poke around
闲逛；搜索，到处找；到处寻找
例句：The man who owns this land said I could poke around here anytime.
这块地的主人说我可以随时到这儿来闲逛。
5.cut across
抄近路，跨越
例句：But the Dreyfus affair often cut across political and religious lines.
但德雷福斯事件往往跨越政治和宗教界线。