Our planet"s alarm is going off, and it is time to wake up and take action!
地球已经敲响警钟；我们必须及时觉醒，采取行动。
——莱昂纳多 · 迪卡普里奥（Leonardo DiCaprio）
【相关单词短语讲解】
【1】alarm 英 [lɑm] 美 [lɑrm]
先来看看其作名词时的用法
（1）[U] 惊恐；惊慌；恐慌：fear and anxiety that sb feels when sth dangerous or unpleasant might happen
The doctor said there was no cause for alarm .
医生说不必惊慌。
（2）[C, usually sing.] 警报：a loud noise or a signal that warns people of danger or of a problem
She decided to sound the alarm (= warn people that the situation was dangerous) .
她决定发出警报。
（3）[C] 警报器：a device that warns people of a particular danger
a burglar/fire/smoke alarm 防盗 / 防火 / 烟火警报器
The cat set off the alarm (= made it start ringing) .
猫碰响了警铃。
（4）= alarm clock
The alarm went off at 7 o"clock.
闹钟在7点钟响了。
再来看看其作名词时的用法
（1）使惊恐；使害怕；使担心：to make sb anxious or afraid
The captain knew there was an engine fault but didn"t want to alarm the passengers.
船长知道一台发动机出了故障，不过他不想惊动乘客。
（2）给（门等）安装警报器：to fit sth such as a door with a device that warns people when sb is trying to enter illegally
【2】go off
在此句中是"（警报器）突然大作“的意思
If an alarm bell goes off, it makes a sudden loud noise.
Then the fire alarm went off. I just grabbed my clothes and ran out.
当时火险警报器响了，我一把抓起衣服就往外跑。——《柯林斯词典》
【3】it is time to do sth.到做某事的时间了
I believe it is time to ban tobacco advertising altogether.
我认为该完全禁止烟草广告了。——《柯林斯高阶英汉双解学习词典》
【拓展】相关表达：
（1）it is time for + 名词
It is time for lunch.
到吃午饭的时候了。
（2）it is time for sb. to do sth.
It is time for us to have lunch.
我们是时候吃午饭了。
（3）it is time for doing sth.
It is time for having lunch.
是时候吃午饭了。
【4】wake up
（1）醒来
What time did you wake up this morning?
今天早晨你几点醒来的？
（2）认识到
People should wake up to the fact that people with disabilities have got a
vote as well.
人们应该认识到残疾人同样也享有投票权。——《柯林斯高阶英汉双解学习词典》
（3）引起注意
The author used three exclamatory marks at the end of the last sentence to wake up the readers.
作者在文章的最后一句连用了三个惊叹号，以引起读者的注意。
【5】take action采取行动，采取措施
I knew I needed to take action.
我知道我该采取些行动了。
We had to take action to protect the proprietary technology.
我们必须采取措施保护专利技术。——《柯林斯高阶英汉双解学习词典》
