我们需要集中精力解决这个问题。

We need to ___focus on solving this problem.

这个科学发现成为整个学术界的焦点。

The scientific discovery became the ___focus of the entire academic community.

你需要先聚焦显微镜才能看清细胞。

You need to ___focus the microscope first to see the cells clearly.