人们听不见狗哨声，但是狗可以。
美国南达科他州，一只名叫“侦察员”的狮子狗正在进行哨声命令和找回猎物的训练。
A hunting poodle named Scout practices following whistle commands and retrieving in Freeman, s.d..
他用尖利的口哨声呼唤他的狗。
突然传来了一阵扭打声，接着亚伯拉罕·葛雷一侧面颊上带着刀伤冲了出来，像一条狗听到哨声一般跑向了船长。
There was a sudden scuffle, a sound of blows, and out burst Abraham Gray with a knife cut on the side of the cheek, and came running to the captain like a dog to the whistle.
狗能明白哨声的意思，于是就按这指令行事。
The dog understands the meaning of the whistling and follows the instructions.
这条狗听到他主人的口哨声，就蓦地开始跑起来。
这条狗听到他主人的口哨声，就蓦地开始跑起来。
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