换言之，基本上超声波的传播声束极窄，这非常有利于将声波集中至指定地点，但对实际听力则无所助益。
In other words, ultrasound essentially travels in a very narrow beam — this makes it great for focusing the waves toward a desired area, but not for actual aural comprehension.
这时，只听见半空中传来一声低沉的声音：“你以为我整天都干什么啊，我好不容易等到今天才把你们这些人集中在一起来的！”
At this time, hears spread a deep and low voice in out of the sky: "you think I am all dry all day long what, I am very not easy to wait until today just chase your se people concentrated together!"
在克拉克笔下，这个“李梅”集中了所有玩具车间工人的特征——为了挣钱养家，“她”从中国西部不远千里来到这家工厂，而现在“她”所能做的唯有叹息一声——“累死了”。
She travelled hundreds of miles from west China to earn money for her family. Now all she can do is lament “I'm tired to death.”
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