作者： Janet B. Pascal
书名：What Is the Panama Canal《巴拿马运河是什么》
简介：Before 1914, traveling from the East Coast to the West Coast meant going by land across the entire United States. To go by sea involved a long journey around South America and north along the Pacific Coast.
But then, in a dangerous and amazing feat of engineering, a 48-mile-long channel was dug through Panama, creating the world’s most famous shortcut: the Panama Canal!