Part 2 字根 表示{行为动作}的字根 ambul = walk 走
			 
			入门字
			 
			ambulance (n.) 救护车
			 
			ambul/ ance
			walk/ 名词字尾
			 
			进阶字
			 
			1. ambulatory (a.) 能行动的,走来走去的
			 
			ambul/ at/ ory
			walk/ 形容词字尾
			 
			He is classified as an ambulatory patient because he can move about freely after the surgery.
			他开完刀还能四处行走,因此被归类为能行动的病人。
			 
			2. somnambulant (a.) 梦游的
			 
			somn/ ambul/ ant
			sleep/ walk/ 形容词字尾
			 
			She can't sleep well because she's married to a somnambulant husband.
			她嫁了个会梦游的老公,所以晚上睡不好。
			 
			3. preamble (n.) 前言
			 
			pre/ amble
			before/ walk
			 
			Many American students can recite the Preamble to the Constitution.
			许多美国学生会背诵美国宪法的前言。