wake-up call

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His wake-up call; his 9/11. It informed him of the coming threat.
这就是他的叫醒电话，这就是他的9.11，告知他即将到来的威胁。
Our month of no spending was a financial wake-up call, a chance to recalibrate our relationship with money at a time when everyone I know has money on the brain.
我们的“不消费月”敲响了一次财务警钟，也是一次重新调整我们与金钱关系的机会。这年头，我认识的每个人脑子里都装着钱。
As Westerners, it is a wake-up call that we are losing our place not just in Africa but in the world—all we can do is to try to understand what is going on and ask different questions.
作为西方人，这就像一记警钟，它提醒我们不仅仅在非洲，甚至在整个世界我们都正在失去地位。我们所能做的就是努力去理解正在发生的事情以及提出不同的问题。

He says the financial crisis should be seen as a wake-up call to change systems and ways of thinking, and to re-establish trust.
This is your morning wake-up call.
这是你早上的闹铃。
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For example, you could request a wake-up call in the morning.
比如你想要早晨的叫醒服务。
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The Flash Crash of 2010 was the wake-up call for ordinary investors that these new markets.
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If something that happens is a wake-up call, it should make you realize that you need to take action to change a situation.

A wake-up call is a telephone call that you can arrange through an operator or at a hotel to make sure that you wake up at a particular time.
If you describe something bad that happens as a wake-up call, you mean that it acts as a warning that action needs to be taken to prevent something even worse from happening.