我是个听力学家。

很多人不知道听力学家是做什么的。

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我会进行评估所以我能查处以便查出他们的听到能力是什么水平。

I work in a hospital. I'm an audiologist. Many people don't know what an audiologist is.
We help people who can't hear and we also help people with balance problems.
I conduct assessments so I can find out what their hearing thresholds are.
If the person is deaf, I give them a small device. That device helps the deaf person hear. That small device is called a hearing aid.

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如果那一个人是聋，我给那个人完全丧失听力，我会给他一台小的机器。

原句的意思表达没太大问题。但在实际生活中，我们很少直接说一个人是聋的。中国人讲究避讳，所以说到有缺陷的人，习惯换一种委婉的表达。

那台机器能帮助聋失去听觉的人听到声音。