不过，她表示，一种新产品得经过多种必需的测试和试验才能使用，而这个过程得耗上好几年。
But she said it would take many years for a product to go through the necessary tests and trials.
经过几年的使用后，质量低劣的部件更用可能出现故障。
After several years of use, poor quality of components used might malfunction.
不过，接触电磁波的好处要经过几个月才显示出来，这说明，其对人类的影响需要经过几年的手机使用才能表现出来。
But the memory benefits of exposure took months to show up - suggesting a similar effect in humans would take years of usage.
经过了几年的试验，使用抛弃型刀片的安全剃刀问世了。
A few years of metallurgy experimentation later, the disposable-blade safety razor was born.
它们在日本已经过用了好多年了，但是只是在这几年，它们才在美国得到大规模使用。
Although they've been in use in Japan for y-e-a-r-s, they're only just now infiltrating the mainstream American consciousness.
经过短短几年的用途，你会怀疑有多少，你永远存活而不使用它。
After just a few USES, you will wonder how you ever survived without using it.
经过短短几年的用途，你会怀疑有多少，你永远存活而不使用它。
After just a few USES, you will wonder how you ever survived without using it.
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