英语语法分析

It was a very difficult first step to accept the positron.

接受正电子是艰难的第一步。

The result is that the electron shadow and the positron shadow are separated.

结果将使得电子的阴影和正电子的阴影被分开。

Positron emission tomography (PET) is an emerging modality in lung cancer staging.

正电子放射断层造影术(PET)是新兴的适用于肺癌分期的检查方法。