这是一个研究小组对学校干预措施实行前后仔细评估得出的结论。

This comes from carefully conducted 'before and after' evaluations of interventions in schools, monitored by a research team.

youdao

5克镭对1930年前后进行的实验的成功作出了决定性的贡献。

5 grams of radium made a decisive contribution to the success of the experiments undertaken in the years around 1930.

youdao

他对 Gran 前后不一致的态度，以及之后他对她的控诉，成为那个时代中一段被普遍认可为事实的历史，将她压得喘不过气来。

The wavering views he voiced about Gran and how he wrote her out of what would become a definitive popular history of the era, crushed her.

youdao

I just want to make mention of this in case there's ever doubt, generally parentheses do solve your problem as an arithmetic but do realize this is some lower level details we'll come back to over time.

是想告诉大家如果你对某些式子的前后运算关系不确定，就加上括号,这都是一些小细节,我们以后还是会再提到的。

哈佛公开课 - 计算机科学课程节选