一個近視的人不能夠準確地調節眼睛以看到遠處物體。 focus sth on sth
He focused the sun's rays on a paper with a burning-glass.

他用一面凸透鏡把陽光聚焦在紙上。
If you focus bright sunlight on dry wood with a glass, it will start burning.

假如你用鏡子將強烈的陽光聚焦于干燥的木頭上,它便會燃燒起來。 focus on sth/v-ing
Today we're going to focus on the question of homeless people.

今天,我們主要討論無家可歸者的問題。
Many firms are focusing on increasing their markets overseas.

許多商行都在注意在國外擴大市場。 focus sth on sb/sth
He focused his mind on his lessons.

他把心思集中在功課上。
You should focus your attention on your work.

你應該聚精會神地工作。
We must focus our attention on the question of reducing costs.

我們必須將注意力集中在降低費用的問題上。
When the coin failed to appear, attention was focused once more on poor Lebeau.

當找不到那枚古幣以后,大家的注意力再次轉到勒保身上。
All eyes were focused on him when he came in.

他進來時大家都注視著他。 focus on sth/v-ing
Today, we're going to focus on the relationship between freedom and necessity.

今天,我們將集中討論自由和必然之間的關系這一問題。
This year our meeting focuses on the question of children's rights.

今年我們會議的中心問題是兒童權益問題。
The show focuses on making fun of politicians.

這場演出旨在嘲弄那些政客。