MPs see worrying parallels with Pfizer's past acquisitions.

国会议员从辉瑞之前的收购中，看到了类似的担忧。

One comes from the companies Pfizer and BioNTech.

一种疫苗来自辉瑞公司和BioNTech公司。

Pfizer says booster shots will be needed within a year.

辉瑞公司表示，一年内将需要接种加强针。

Has Pfizer done that? No one knows yet.

辉瑞公司已经做到了吗？目前还没有人知道。

The Pfizer biontec vaccine requires two doses per person.

辉瑞生物疫苗每人需要两剂。

Like the Pfizer vaccine, a second shot is required.

和辉瑞疫苗一样，Moderna疫苗需要第二次注射。

The Pfizer vaccine showed benefits in smaller, limited testing.

辉瑞公司的疫苗在小规模、有限的测试中显示出优势。

The vaccine is made by the American drug company Pfizer.

并由美国辉瑞制药公司生产。

It costs much less than vaccines from Pfizer and Moderna.

其价格远低于辉瑞和莫德纳生产的疫苗。

Are there any challenges that come with the Pfizer vaccine?

辉瑞疫苗有什么挑战吗？