我懂得核聚变，因为我是物理学该领域的博士。
Now, I know about fusion because I did my Ph.D. in fusion physics.
为了测试一种关于太阳内部核聚变反应频率的假说，物理学家根据假说，计算出太阳每年能产生的中子总数。
To test a hypothesis about the frequency of fusion reactions in the Sun, physicists calculated the number of neutrinos the Sun would produce annually if the hypothesis were correct.
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