1.I think I should join Jolie in her efforts to change advertising tactics(策略)when it comes to advertisements for children.

2.However, policymakers were not yet acting on many important environmental problems.

3.College students were a major force in the campaign, although participants of all ages were involved.

4.thirty years later, the focus has changed but the urgency remains the same.

5.X-rays were first discovered by a German scientist, Wilhelm Conrad roentgen, in 1895, almost by accident.

答案：

1.涉及到针对儿童的广告，我想我应当与Jolie一起努力去改变广告策略。

2.然而，政策制定者们当时并未对许多重要的环境保护问题付诸行动。

3.尽管参加这次运动的人涉及到各个年龄段的人，但是大学生是这场运动的主导力量。

4.三十年之后，关注的焦点发生了变化，但其紧迫性依然。

5.X射线初是在1895年被一个德国科学家偶然地发现的，他的名字叫Wilhelm Conrad roentgen。

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