在美国，由于“回声潮一代”——即数量突增的年轻人口——起到的促进作用，“多户公寓”租赁业的前景向好。
In America prospects for the "multi-family apartment" rented sector are helped by the "echo-boomers", a youthful bulge in the population.
蝙蝠耳朵的外部结构在接收回声时也起到重要的作用。
The external structure of bats ears also plays an important role in receiving echoes.
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