在进行任何结构性改动之前，你需要获得房东的许可。

You need to ___obtain permission from the landlord before making any structural changes.

这些书的初版现在几乎不可能获得了。

First editions of these books are now almost impossible to ___obtain.

在第二次实验中，研究人员获得了一个非常清晰的结果。

In the second experiment, the researchers ___obtained a very clear result.