Following a telephone call to the police from an anonymous caller,hundreds of shoppers were shepherded out of the store while roads in the area were sealed off.
follow此处意为“在……少后”,其现在分词形式引导句子的状语。anonymous意为“匿名的”。be shepherded out of意为“从……中被引导出来”，shepherd此处为动词，本身含有“带领，引导;护送”之意。如:
The super star came in, shepherded by her guards.
1. seal up意为“(为防止空气、水等渗入或渗出)封闭”。如:
Those doors have been sealed up for years.
2. seal sb.'s fate意为“决定某人的命运(尤指厄运)”。如:
The words would seal his fate for ever.
3. seal in意为“密藏，封住”。如:
Fry the fish quickly to seal in the flavor.