Before attending college, students have a limited opportunity to specialize.

Pick up your room before you go to school, Linda.

琳达,上学前把你的房间收拾好.

I can finish watching all the events before the university opens.

在学校开学前,我可以看完所有的项目.

A child's awareness of their identity as an individual develops gradually before starting school.

孩子的个体意识在上学前逐渐形成。

Money should be invested in educational initiatives to support underprivileged pre-school and early childhood children.

资金应投资于教育计划，以支持贫困的学前和幼儿期儿童。

Britain's state-run pre-school childcare is among the worst in Western Europe.

英国的公办学前儿童照管是西欧最差的之一。

Li Na is one the way to see a film with her cousin.

(李娜和她的表哥正在去看电影的路上. )

I want to break up with Li Na.

我打算和李娜分手.

May I speak to Li Na?

我能跟李娜通话 吗 ?

Hi, it's Li Na here.

你好, 我是李娜.

Li Hui, this is Li Na.

李辉, 这是李娜.

May I introduce Li Na to you?

我能把李娜介绍给你 吗 ?

Oh, Li Na, you have changed a lot.

哦, 李娜, 你的变化真大呀!

Hello, is Li Na there?

你好, 李娜在 吗 ?

This is Li Na speaking.

我是李娜.

This is Li Na, and this is Li Hui.

这是李娜, 这位是李辉.

Li Na, I'd like to introduce you to my assistant, Li Hui.

李娜, 我想把你介绍给我的助手李辉.

Thank you for coming to Li Na's birthday party.

谢谢你们来参加李娜的生日聚会.

Algae are not closely related to each other in an evolutionary sense.

从演化的意义上看,藻类彼此间的关系并不密切.

In recent years , more attention has been attracted to algae pollution.

藻类污染作为水体污染的一部分,已引起人们的广泛关注.

Algae microorganisms in the water populate because of the surplus nitrogen.

水中的藻类微生物会过量生长,由于过量的氮肥.