每年，成千上万3到13岁的孩子在全美各地的国家公园成为初级护林员。
Every year, tens of thousands of kids aged 3 to 13 become Junior Rangers in different national parks across America.
在全美各地，服务员比劳工多，游乐场工作人员比工程师多，店员和销售代表比建筑工人多。
Across the country, there are more waiters than labourers, more amusement park attendants than engineers, and more shop assistants and sales reps than construction workers.
在全美各地，这样一场发生在医生办公室的战斗对于儿科医生和孩子父母来说都是令他们沮丧的。
By all accounts, it's equally frustrating for pediatrician and parent - a battle that plays out in doctors' offices across the U.S..
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