It is very difficult to make them out clearly but they appear to be the letters CE, or it could be the letter b.

要将它们清晰的辨认出来并不容易，但是它们貌似是字母ce，或许是字母b。

youdao

She was B. revising what she had written so as to make the theme stand out more clearly.

她正在修改她写的东西以便使主题更加突出。

youdao

It turns out in the case of Hepatitis B, the way the lifecycle proceeds-- the cells make too much of the protein and not all of it gets assembled into the virus.

结果显示,在乙肝的病案中,病毒生命周期的发展情况,细胞制造了大量的蛋白质,但并不是所有的蛋白质都会组合成病毒

耶鲁公开课 - 生物医学工程探索课程节选

Before you make that tradeoff you might want to check out Royal Dutch Shell ( RDS.B).

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