But you know what? We need to focus up.

但你们还是要专心打比赛。

In this shape, the lens can focus up close images onto the retina.

在这种形状下，晶状体可以将近距离的图像聚焦到视网膜上。

In a healthy eye, muscles have to squeeze the lens in order to focus up close images onto the retina.

在健康的眼睛中，肌肉必须挤压晶状体才能将近距离的图像聚焦到视网膜上。

All right, so we focused up until now on integers, really.

好吧，所以我们一直关注整数，真的。

For example, falcons and eagles can focus on a small mouse in the field up to a distance of one mile.

例如，猎鹰和老鹰可以盯着一只在一英里外的田野里的小老鼠。

All the phrasal verbs in this lesson include the particle up and by focusing on up we get to study the meaning and understand how the verb is influenced by the particle.

本节课中的所有短语动词都包含助词 up，通过侧重于 up，我们可以学习其意义并了解动词如何受助词影响。